How hard to change control arm bushings?

[REPO1]

I know its something I can do myself, but is it a real pain in the ass? Or should I just hold off, and do the disc-brake conversion at the same time later on and put new bushings into the new style arms I will be installing?

The reason I ask, is because the uppers are shot, and I won't be doing the disc brake thing for awhile yet.

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Sylvan Lake, Alberta, Canada

1970 Chevy C20 Custom Camper
#s matching 402BB Turbo 400 trans.
Air conditioning, power steering, manual brakes.
73,600 Original Miles!!
(Add on 2000 more from raod trip!)