easy way to replace trailing arms?

[RIA69]

ok so I'm new at this, I cannot for the life of me figure out what the best way to remove my old trailing arms is to replace them. i have been having one head ache after another trying to pull everything off just to get to the u bolt to take that off and its rusted through solid. so i have to cut it off I have tried everything else. but what is the best way to jack it up or leave it down? any help would be great thanks.