-you need to do it with the engine cold
-make sure you bring each cyl to TDC before adjusting the valves for that cyl
-use the right feeler gauges
-taking the plugs out makes it easier to tur the crank by hand

this is for a B18C, but it's the same basic principle:
http://www.c-speedracing.com/howto/v...lveadjust.html