It is a major PITA. You'll wish you had taken it to a machine shop.
I've used this
one and while it was enough of a pain that it took 2 of us to do the job we did get it done. Make sure you have something handy like a magnet wand to fish out the keepers. Guaranteed to drop into your head at least once
Has anyone ever used a spring compressor like
this? Seems like there would be clearance issues.