Make darn sure the doors line up properly BEFORE you do any cutting. A lot of times it involves shimming up the front mounts (the front cab mounts) an inch or more, if you plan on running the hard top then make sure it's bolted up securely and fitting correctly. Take measurements on the door openings, the windshield frame etc. Once you cut out the rocker boxes and cab supports there is no structure left and the firewall and windshield frame are free to flop around. Take your time and make sure everything is braced, and don't be afraid to take the doors on and off at every step.