We are up to do ours too....
I have a valve spring compressor I used before, but its different to the ones I have seen for the job....
Its this one...
http://cgi.ebay.com/ebaymotors/VALVE-TOOL-SPRING-COMPRESSOR-INSTALLER-REMOVER-TOOLS_W0QQcmdZViewItemQQcategoryZ35625QQihZ007QQitemZ170051512622QQtcZphoto#ebayphotohosting
Do you guys think i can make it work?