man, it sure will be scary with all the lifter noise
and it will a little tough to get the lash right /not being able to fill the tension from the lifter
I lube them good but I don't pump them up. They should stop rattling within 10 seconds of startup unless you've got a bad one. As far as feeling the tension, make sure that all the adjusters run all the way top to bottom of threads so a tight one don't give ya a false feeling and lube the threads with oil. Next pick one rocker/pushrod/lifter combo that you can see the lifter piston when it moves away from the cir clip and practice getting the feel. I usually start with the pushrod in the lifter and the cup end about half way into the adjuster ball end. Tighten slowly till the cup is just seated in the adjuster ball end then 1 more turn.