overwhelmed by registry

That happened to me the other day-  I have no idea what to ask for- what color furniture, what's worth it, what I'll get no use of, what size stuff, car seats, do I get 2 swings for the twins or just 1 and let them share?? 😱😱😱  what if I choose is too expensive?  I feel like I'm being rude asking for things that are expensive... and what if I forget vital necessities?   1st time mom- and with twins -  yeahhhh. --- super overwhelmed...   oh and PS. We have yet to even touch the babies room and I'm almost 21 weeks .. any advice?  What are you picking out?  What are good sized car seats for tiny twin boys?