Il Mio Problema
The power supply died.
La Mia Riparazione
The guide was spot on. There are a lot of fiddly bits with adhesive that are a pain, but can be dealt with.
The new supply dropped right in and works great. My old iMac is still running just fine.
Il Mio Consiglio
I had a couple of very strong magnets. They make getting the bezel off a very easy process. Much easier to do than with a credit card.