The instruction link on HKPRO is probably the best I have seen.
Once you've done it a couple of times it takes just a few moments to detail strip a USP. You just have to think a bit. It helps to refer to the exploded view in the owners manual.
AMEN! The detail stripping instructions found off the hkpro site are probably the best I've ever used. In fact, they're the only instructions I've used!