Hardest part is getting ahold of some non-fuming nitric acid. I found a procedure an old friend Travis Goodspeed has been using that doesn't require NFNA nor a vent hood, but I'm a bit wary about doing it, as it may be overly destructive to the ICs.
Yeah, that would be me. I had originally proposed decapping the Jailbreak chips before PSGroove had been released. I had everything I needed, I just needed access to a 100x or higher optical microscope (which the University graciously said I could use). I have a spare memcard board from an old broken PS3 sitting in my shed somewhere. I'll find it, and see if I can decap it.