I figure shaving before you grow any hair is a good idea. You'll get used to doing it, and when little scraggly hairs start awkwardly growing in if/when you start taking T, you'll already be in the habit of shaving them off until you can grow a more full beard to trim. It is weird, but personally, I hate having peach fuzz on my face anyway. Mine's not thick or dark, but it's considerably long and I hate it. So I'd rather just get rid of it.