I took an old valve cover years ago and cut a strip out of the top about 2 inches wide, the length of the cover...
this is what I do, start the motor, get it to full operating temp and then shut it down, remove one cover and put on the "modified" cover on (this lets you do the adjustment while the engine is running and not have hot
oil leaking all over everything), one at a time I loosen the adjusting nut slowly till I hear the valve "ticking", then tighten slowly till it stops and then go from 1/4 turn to 1/2 turn, repeat on all valves and then go to the other side of the motor........been doing it this way forever (almost) and have never had a problem with my valve train..........
David