It's funny, it's a bit like your TV...you get used to what you have. With wet plate, I started at 4x5, then moved to 8x10 and progressed to 11x14. Now I'm starting 24x32 and I find the 8x10 small in comparison. If you're prepared and experienced with what you do, you know what to expect. That only comes with time. Anything seems intimidating before you take it on.
I think you'll eventually work out your own limitations and they might be different to other peoples experiences. Common things are....be prepared to take time to prepare and to carry a lot of gear in the field (I have a dedicated caravan darkroom that makes it easier). Be ready to fail at times and push through those failures. Above all...have fun!