There's not really and order you have to go buy but 1st block the front wheels and jack the rear up using what ever you got to support the "rear frame" id prob start with the drive shaft and then move on to the upper and lower trailing arms,shock then brake lines and e brake cables.and what ever else i may be forgetting,i think the hard part is getting the trailing arm nuts/bolts loose with out a torch to heat em up. i know for me it was hardest part, when i replaced lower ones i used a 4 foot beaker bar and impact socket
easiest way to do the drivers rear trailing arm bolt the "front one" if it's never been out then chances are that gas tank is in the way from it coming all the way out, so just grind the head off and knock bolt out with punch and hammer
so what were you doing when that broke ? lol