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My eyebrows and I have been through a lot together. When I stumble upon old photographs from childhood, the shape of my brow serves as the keeper of milestones.

Too young to care or notice that a unibrow was slowly growing, and then poignantly aghast practically overnight, I began tweezing my eyebrows at about 11. I started simply by making sure I had two rather than one. In middle school, I experimented with different shaping techniques — arched too close to the center or blocks straight across — always awkward and rarely symmetrical.

Over the years I got closer to something that was passable. About five years ago, I finally managed to find the sweet spot in my arch, about three quarters of the way in. Today my eyebrows are full and sculpted and require near daily upkeep. They’re quick to solicit commentary. Recently someone complimented me on how natural they looked.

In nearly 20 years of eyebrow grooming, I had always done it myself. I thought I had it nailed.

Until I visited Sania Vucetaj, one of New York City’s top eyebrow experts and shaper to the stars. Ms. Vucetaj was a mainstay at Bergdorf Goodman for more than 20 years before opening her own studio, Sania’s Brow Bar, in the Flatiron neighborhood.

“I love a fuller brow,” Ms. Vucetaj assured me. “I promise they won’t get any thinner. I just want to show you what I would change, and then you can decide.”

She took her eyebrow pencil and aligned it parallel to my nose, right along the edge. “This is where your eyebrow should start,” she said. “Do you use a magnifying glass? Get rid of it. You see too close, and you start going too far.”

With family roots deep across Europe, my eyebrows grow thick and frequently. “My natural instinct is to go all in,” I told her.

“Let’s start with what not to do,” she said. “Most people take out too much in the center and try for arches, but you have to take a step back and look.” I had committed the original tweezing sin — overdoing it — without even knowing.

“There’s a difference between heavy and full,” she said. “You want to make sure they act as frames so the eyes can stand out.”

I took a deep breath, and let the tweezing begin.

Tweezing is your best option

Tweezing is the most natural and precise removal technique, Ms. Vucetaj said.

“Waxing stretches your skin, and there’s no precision,” she said. “It’s wherever the wax falls, and that’s your shape.

“Threading breaks the hairs, and there’s also no precision.”

Waxing and threading are also less hygienic, she said. Wax is sometimes not warmed up enough to kill germs that may be on the application stick; and threading, the use of a small string to loop around hair and remove it, involves putting the string in the threader’s mouth.

A new trend called microblading offers a semipermanent option to draw on individual strokes of eyebrows in a tattoo-like application. Ms. Vucetaj also shies away from that procedure.

Tweezing should be done at most every two weeks.

“People go in and they attack,” she said. “Do you ever notice tiny, thin strays on somebody’s lid? No, so they won’t, either. Stop obsessing.”

Pull the hair in the direction of the growth as close to the root as possible. Removing the hair in the wrong way will make it grow back coarser and thicker, she said. Tweezers last for four or five years. Ms. Vucetaj recommends cleaning the tip with an alcohol swab once a month to remove residue.

Don’t go freehand

Ms. Vucetaj uses a light powder-based pencil to “outline the shape of what you’re going for.”

“Fill it in with a pencil, top, bottom and underneath, to make them look symmetrical,” she said. “Once they look symmetrical, use it as an outline. You can go in and tweeze little hairs around it to make sure the root doesn’t sit inside the line.”

“If you do it freestyle, you’re not going to get it right,” she said.

If you can’t figure out where your brows should start and end, Ms. Vucetaj suggested watching videos online, going to an eyebrow specialist or asking someone on the street.

“If you see someone with good brows, ask them what they do,” she said.

Keep perspective

Ditch the magnifying mirror and bright light and take a step back into more-natural light, Ms. Vucetaj said.

“If you’re using a magnifying mirror, you’re seeing hairs too soon, so you’re pulling way too soon, and it will result in some ingrown hairs,” she said. “If you can’t pull once, it’s not ready, step back and wait a couple more days.”

Trim to keep the shape

Trimming long eyebrow hairs is just as important as tweezing in order to preserve the shape, Ms. Vucetaj said. Using a spiral eyebrow brush and nail scissors, brush the hairs upward like a feather and lightly trim them at an angle in the direction of the eyebrow.

“They look fuller once you trim the tops,” she said.

Brushing and trimming your eyebrows and keeping any type of lotion off them is key to a fuller brow, especially for those looking to grow them back, Ms. Vucetaj said. She recommends avoiding any type of lotion, moisturizer or gel on your eyebrows.

“It blocks the growth and makes them shed,” she said.

For the fellas

Ms. Vucetaj offers men their own grooming suite at her studio, and often sees “clumps and choppiness” in the brow lines of men who often have their barber trim their eyebrows.

“Don’t let your barber chop into them,” she said. “They should be brushed up and trimmed straight across, it makes them look even and clean.”

The No. 1 eyebrow offense in men is having too big a space in the center.

“Once you separate it, it makes all your features look too wide and throws off the balance of the face,” she said. “Especially for men, less is more.

“If you do the arches, or they’re overdone, it alters the guy’s face.”

Ms. Vucetaj finished the last stroke of her pencil on my browline and outlined where I was to let the hair grow back in. I left Sania’s Brow Bar with a plan.

“Look at how your eyes look more awake,” she said. “Symmetry is everything.”