Take them off however is easiest. When I re-intsalled, I left the bolts on the control arm end "hand tight" and then tightened it up the rest of the way with the weight of the car on it. I don't know that you really need to but I'm one of those dorks that follows directions.
Here's some pictures that might help:
http://www.240sx.org/atlanta/TC_bushing_install.htm