As the valve clearances are overdue, you'll want to be doing them, checking them is fairly easy, you just need a feeler gauge and some patience. Adjusting them is a little more involved and means removing the cam shafts. It's not massivly difficult but if you get it wrong you can trash the engine.
The main site is often ignored, but it has a weath of knowledge on there:
Go to
www.sv650.org and look at the FAQ and How to section.
Manuals here:
www.sv650.org/sv_manuals.htm