Good luck on your IVF journey! It’s definitely a steep learning curve in the beginning, but you’ll find you’re soon an expert.
As far as protocol and OHSS, that’s what you’re paying the big $ for, so try to trust your RE and trust that they’re going to use the protocol they most think will work for you (without giving you OHSS).
I would recomend joining a thread that corresponds with the month you’ll be cycling, so either December or January. You should be able to find them under " IF treatments" the “IVF” then look for the month you feel more comfortable in. Once you start comparing stories, you may find that what your RE is doing is very consistent with what others are as well. That may give you more confidence.