The trailing arm bushes have to pressed out, I have found you can make your own press easily with a bottle jack and a couple of bricks and a set of stairs. Put 2 bricks on the ground and line up the trailing arm so the bush gets pushed out towards the ground. Place the bottle jack so the base is flush up against a step then jack away.
I highly dont recommend doing it unless you are prepared to get hurt or break your steps, neither happened in my case but you might not be so lucky.
As for costs, just for the upper trailing arms I paid around $45 for a pair of rear upper trailing arm bushes, and the pair of front upper trailing arm bushes were $35. Both are nolathane.
Dunno about the rest but I'd expect the lower trailing arms to be around the same price for the upper rear ones as they are around the same size.
Phat Drift Damaged
Cobalt Blue 1994 EF XR8 5 spd
Fully optioned - Sunroof, cruise, body kit
Stock as a Rock for the moment