I usually do them on motors out of the car.
However, on the couple of motors I've done in the car, I've found that you need to pull the radiator. Then you have room to get in with a puller - *never* been able to get it off with a screwdriver! Some engines you can, that's easy, but typically not a Ford
Definitely a DIY job, buy a $30 puller from Supercrap it's all you'll ned as a home mechanic. You'll use it once and then probably lose all the bits anyway :) Good excuse to change the coolant in any case.
Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes
Pacemaker headers + 2.5" exhaust
EF Fairmont interior
Lowered King springs
5 speed manual
Newest mod: EF Ghia wiring loom and dash