We have all started where you are

Just walk in and ask for some help in trying on a few white gold bracelets.
I would go to Fifth flagship for the most stock,* and on the second floor, VCA has a small counter of heritage pieces. Vintage pieces that they sell. These days, a lot may not be available to try on, but definitely ask. Try to relax and enjoy
Two tips:
When I started to buy jewelry, I always asked to try on; see it in a mirror close up; and see it in a full length mirror.
I also always ask if they mind if I take a pic of both angles ( this is bc I want to compare it with other options but you don’t have to say that if you don’t want to; and, no one has ever said no)
And, when I go try on jewelry, I wear the same thing. V neck black sweater; charcoal pants bc I think that wil give the jewelry the best chance to shine. But that is bc this is typical of what I wear daily. If you love bright color, then wear that.
But, if you go back home and are trying to decide if you prefer the WG Alhambra or frivole, and you are looking at a pic to jog your memory, I think it helps to have the clothing recede.
VCA at Hudson yards is more laid back, but it’s a long trek for many of us
* also, VCA Fifth is close to Bulgari where you can try on white gold serpentis etc. and Bergdorfs where there is a selection on the ground floor and vintage/antique IDK on a higher floor , maybe 7? There is also Chanel jewelry which just opened next to mikimoto, and they have jewelry just for display including the 55 karat diamond shaped like a perfume bottle. Many people just go to ask to see it. And, the newlybrefurbished tiffany has a ton of artwork on every floor that Peter Marino commissioned for the store. There is also an exhibit from the Marino foundation, but I don’t know if it’s open to the public yet. Finally, there is also David Yurman on 57th.
If you can go when stores are less crowded, typically am on weekdays, SAs will have more time to show you things.
ETA: I would never buy anything that I did not try in person first. And jewelry is like perfume. Once in a while, you love something so much that you must walk out with it, but more often than not, people have to think about a piece.
I don’t ask for a business card. I ask them to write down the info of any piece that I am remotely considering, and if they are available later in the weeK. As they are providing that info, they will include their contact numbers. Of course, if they are irritating or impolite, you should never buy from them. you can always ask for someone else who may have more time to assist.