What I usually do is stand the tire up on the ground, lube it, and jam one edge of the wheel rim into the hole as hard as I can. It hits the bottom of the tire/bead, and stays there. Put the wheel down, and push the rest of the tire over the rim. I used to use tire irons. Now, do the same, but use the tool. It really worked fine, it's doing the exact same thing to the lower bead as it does with the upper bead, except it's easier.
Oh I used to be disgusted, but now I try to be amused-E.Costello
'01 Kawasaki W650, '05 Yamaha XT225