For the trailer to stand maneuver:
You jack it off the trailer onto stands, moving stands as you go about slowly moving the trailer out from under (i.e. move the stands each time a cross bar comes up to it)
for the painting bit - MANY threads here discuss it. Search them out with the search tool.
One hint, for gelcoat repair - either get matching gelcoat, or get Marinetex - and lots of sandpaper.
Lessons learned are opportunities earned.