control arm bushings

[fdbdw]

71 c10 rear coil, Going to replace the contol arm bushings, is it as easy as un-bolting the cotrol arm, letting it drop and replace the bushing and bolt it back in or am I in for something I dont know about and I need to block out a whole day, any advice on the best way to do it and do I need to jack it up or do it on its wheels, thank you, pics comming when I can figure out this whole computor and digital camera thing