So looking at manuals it seems j35 engines have 3 angle valve job. I am doing head gasket.. and was hoping to do light valve lapping. Mostly to get rid of imperfections due to debree caught up between valves and head.

I've don't this before on many other cars. With really good results. No leakage at all aftetwards. Before there were leaks here and there. Used alcohol for leak test
I just don't want to screw up this 3 angle valve job by honda. Is this something to worry about too much?
I use permatex valve grind compound.

I may be mistaken about 3 angle valve job in Hondas j35.. maybe its standard single angle. Pictures suggest it's 3 angle

 

I had a 5 angle valve job and lap the valve to the seals using the same stuff. Just go by hand and no power tools. You should be okay. Also clean everything off very very well. The lapping compound will destroy the valve guides if it leaks down and doesn't get cleaned out

 

Fantastic.. lapping now. I use a drill and connect the valve via vacuum rubber hose. Of course drill really slow. By hand takes too much time)