Well I wasn't first, but this is how I do it
Use a 5 gallon bucket upside down, place the rim on it, lube the tire and you can push and twist the lower bead by hand, I use 3 tire tools from amazon for $15 and like a bike tire walk it around. NOW heres the real trick, first tire iron came over the rim, pushing the tire down and that part of the tire beed let it set into the deepest part of the rim, not just below the lip but where the rim dip inward towards center, this allows the tire to reach farther on the opposite side and not tear the bead. I have even needed to mount wheels upside down it the offset is to positive or negitive .
Just pay attention to where the bead rest, and if its to hard to cam over the rim with a tool, than put youe kneed on the tire and push it down farther into that dip/dished area.