I have layers in my hair, mainly because I feel like when it's all the same length, mine looks somewhat dull. Plus, since I do ponytail it a lot, I like the tips coming to a taper rather than all ending at the same length. So it's layers for me!
BUT! How many layers? How far apart to layer? Face framing or all the way around the back? Cut to a V or straight across the bottom? Ahhhhh.....
Grace, I would suggest that since you're not ready for anything drastic but would like to try something new, get it done gradually.
I wrote several posts back that your hair is long enough that if you got 4-5 inches chopped at a time, that would give you something very different but would also grow back in less than a year if you didn't like it.
Same with layers and shaping, too. Try some gradual layers around your face. If you like that, have them add more in the back. If you want to try a V-shape, I would suggest asking them to cut a "gradual U" shape in the back first because again, it will grow out quickly if you don't like it.
Hair is such a personal expression. Left naturally, my hair is straight like yours but is probably finer and has less body. I can't get it layered when it's straight because it looks choppy and the ends stand out; but when it has curl, a blunt cut is too severe and I actually need the layers. I only know this though from years of experimenting and trying a lot of things (some of which, I didn't like at all!!!)
I hope you feel confident in trying something new, even if it's just a little bit at a time.
You'll look great, and, we'll all be cheering you on.