I replaced the AC compressor in my silver Formula yesterday. It took a lot longer than i had imagined.
Whoever put in the last one must have been trying to show his muscles, because nearly every nut and bolt was tightened to extreme, and I had to come up with clever ways to get enough leverage for my 73-year-old muscles to get them loose. It's a wonder nothing broke.
And then on re-assembly I found that I didn't have a new one, of one of the washers between the lines and the compressor. What I tried first leaked -- the system wouldn't hold a vacuum, so I wound up re-using the old washer. It seems to be holding.