James, keep in mind this is no substitute for doing it the "right way" with complete disassembly, but does let you make quick and easy changes to get yourself into the right ballpark.
Basically, you remove the bars, and bar clamps, then loosen the top triple clamp bolts. Simply loosen the top cap...not the 50mm cartridge nut, the base valve only (silver one with the clicker in it). You can remove this without greatly effecting the oil level in the cartridge, if you are careful. You will usually have to compress the fork some after they are unthreaded in order to get hold of them to pull them out. There will be significant vacuum created, as these are sealed, so be careful. Keep steady pressure on them and ease them up (it won't be easy :scream: , taking care not to let them fly across the room when the vacuum finally "gives it up". Once out, make shim changes and reinstall.
As I said, once you get the shim stack to where you are happy, I would suggest a total disassembly and rebleed of the cartridge, as you can create a small air pocket at the top of the cartridge if you loose enough oil. It's a quick and dirty adjustment that I am sure Jer and others are cringing at, but does work, at least for testing purposes. ;)