I read up lots about doing wishbones before i did mine, getting the ball joint pinch bolt off and re-locating the rear wishbone mounting bolt seem to be the usual problems. As does the fact that both the wishbone bold heads and nuts are both 21mm (who of us diy'ers has two 21mm sockets?)
I used a smear of copper grease on the inner surface of the subframe mountings and a little bit on the rear bearing steel insert, made it easy to line up, especially if you used the bolt inserted from underneath and whacked it in with a hammer first to line up the joint (you are replacing the bolts anyhow aren't you!!)
Pinch bolt was my problem, had to take the brake calliper and calliper mounting off first to get an 18mm socket on it squarely, easy enough to do, but annoying delay.
And a 13/16th AF socket fits better than a metric one on the 21mm main bolts anyhow

Mine took me 3 months to do! is that a record?