Hey guys, a little help here please.

This fall/winter is gonna include body work. Will be doing left and right cowl, inner cowl, kick panels, floor pans and cab corners. I'm assuming starting with the outer cowl panels and work my way in...one side at a time. Looking for pointers and tips to help me along and things to expect. I can almost bet that cowls are a pain in the rump. Do I need to worry about bracing cab?

Also, some tips on floor pans as well. For example, i need to replace all the way back to the existing seat frame. Any suggestions on how to tie into this? I currently have some tiny separation between the factory floor pan and seat frame.