170 & 225 head swap?

I got my head on last night and all torqued down, put the original rods from the 225 in and set the rocker shaft from the 170 on and got to thinking ( I tend to overthink things sometimes) these rockers are set to whatever the 170 rods/lifter were set to on the 170 and maybe they will screw something up when I bolt the rocker shaft down...maybe I should loosen all the adjuster on the shaft before I torque the shaft down and set them after that?? I'm worried I may screw a rod was my thinking.

That brings me to my next issue, setting the valves as I've never done this. I've watched EVERY video on youtube on how to do this and most are done with the engine hot/warm & running. Well I'm not sure I'm brave enough for that if I don't have to, where can i find some literature or video on doing this with the engine hot/warm and not running until I can find someone who can set them properly?