I checked mine last year and produced a PDF guide for the UK VFR club. Ive attached a copy of it and also a copy of the blank shim check sheet for anyone wishing to print it out.
Here is a link to the original post over on the UK forums - http://www.bikersoracle.com/vfr/forum/showthread.php?t=127057
The guide contains all the instructions and tools needed to check the clearances and also change the shims etc with some details about removing camshafts etc.
I apologise if the link breaks any forum rules. MODS - please feel free to remove the link if im breaching any rules.
VFR800 shim check and adjustment - Honda VFR Club.pdf
VFR SHIM CHECK SHEET.pdf