Re: Valve lash questions.
The feel is something you develop.
To begin with, take a thin feeler gage or a small piece of paper and put it between the valve and rocker tip. As you tighten the rocker nut, move the paper or gage back and forth to determine when the zero lash is obtained (drag on the paper or gage). Then you can roll the pushrod to determine what it feels like if you choose to use that method.
Personally, I set the rockers cold before starting, but then readjust them hot. Most of the time, no adjustment is needed on a hydraulic cam.