Not sure if this will help you
http://www.youtube.com/watch?v=pgZymnFuMe0
But defo need to find Top dead centre before setting the valves
Otherwise you can't be sure you got the correct clearance.
And yes at TDC you can set both valves at the same time
If you get completely stuck post up a close up pic of the left hand side of the engine. I may be able to talk you through it