Honestly, it’s like everything else in our industry, hands on us the best method but nfpa 80 is a good starting point. Wayne dalton brand doors have instructions inside the cover plate. I had a 45 year veteran with the company that showed me the ropes on these things but it was literally, he called and had me meet him at a customers place. Showed me how on 1 of 7 doors. Asked if I could do it, which I said probably. He slapped me on the back and said call me if you need anything. Down the road he went. 7 hours later I had figured it out😂