First write down the firing order you have it. Then rotate the engine by hand until you see the Number 1 exhaust valve open. Now back off the #1 intake rocker until you have lash. Now tighten the poly lock nut until all up and down play in the pushrod is gone. Once you get there, tighten the nut another 1/4-1/2 turn, Then tighten the set screw. Then give the poly lock a little tug to set the entire nut together.
Rotate the engine in running direction until you see the next piston in the firing order exhaust valve open and repeat. Continue with all the intake valves until you have gone through the firing order.
For the exhaust valves, go back to piston #1 and rotate the engine until the intake valve opens and then moves closed. About a little more than 1/2 closed, adjust the exhaust valve using the same method as on the intake. Rotate the engine and continue through the firing order until all Exhaust valves are done. If you are good, you can do the entire engine in 2 rotations.