well I have done the 4-bolt control arms two dofferent ways. Once we moved the engine around (on a zetec,mtx) and the second time we dropped the subframe (on a duratec,mtx) and I will say dropping the subframe is the best way to go, more so for the 2 bolt arms.
with out dropping the subframe you have to fight to load up the bushings to get the arm into the subframe while working around the hub. The 2-bolt arms have to be installed straight into the subframe because of the design. This means if you don't drop the subframe you need to pull the strut and get the hub out of the way.
To drop the subframe all you need to do is get it down about 4 inches. All you need to disconnect is the steering wheel (done from inside th cabin), the two roll restrictors and the 4 subframe bolts. When taking the sub frame bolts out use plenty of PB blaster and work the bolt in and out. If the bolt tightens up do not force it. you need to run the bolt back in and use more PB blaster as the thread has become full of junk. On my fathers 95 he did this and the nuts didn't come free giving us that issue, just take your time and don't rush. Also you will not be able to drop the sub frame al the way out because of the power steering lines and rack, just support the engine/trans with a jack and use another jack or jackstands to support the subframe.
It was really easy and took about the same amoung of time, taking our time as it did to force the arms in with the subframe still bolted up.
