I have only "tweaked" the drivers door on my Midget, but on other vehicles that I have had the "pleasure" installing & adjusting doors in the past, as mentioned above get a scissor jack to support, doesnt hurt to cover edges with masking tape (to protect the enivitable slpis) & then start by getting the obvious adjustments done (make the door fit in the opening with out hitting paint), then make the small tweaks to line up the panels, remember a 1/16 of an inch adjustment at one end of the door can change the alignment a considerable amount at the other end, have patience & don't be afraid to use a few shims or gentle "encouragement"...