Afraid to drive bigger vehicle.

Going from a Honda Civic to a Honda Pilot. I'm scared shitless. I will have 1 in an infant car seat, 1 in a forward facing convertible car seat, and 1 in a 5 point harness booster seat. My little car is too small for all of these so I'm making the leap to a bigger vehicle. Had anyone else had to do this?
I'm SCARED to drive a bigger car. I'm already not confident when driving in tight spaces and I'm getting anxiety just thinking about it. 
Advice? Help. 😩😰