It's not bad. Just take your time.
Start with one cylinder, bump it over until the exhaust valve is just starting to open, and then set the intake valve. Get zero preload by feeling the pushrod, then go a 1/2 turn past that. Then bump it over until the intake valve on that same cylinder is starting to close and set the exhaust valve the same way. Then just move to the next cylinder.
Some guys use the TDC method, but I feel the EVO/IVC method is the best. It works for mild cams and it works for the wildest ones.
Do you have good
oil pressure? Did you prime the
oil pump to make sure
oil is getting to the rocker arms?