I really wish I could remember what I did. I set the oven fairly high and left them in there pretty long compared to what people say. I had to make sure I did not let the tires overhang the cookie sheet they were on as the direct heat from the bottom of the electric stove would melt them (had 1 mishap due to that).
I used those kevlar/woven gloves you buy at BedBathBeyond/Menards made for cooking.
I want to say 350F for 20-30 minutes. I'd pull the tires out, put the rim/tire centered on top of an old rim I didn't care about on the counter, then gently push the tire down with both hands and normally, the entire bead would pop at once. Then I flipped the tire and did the other side.
I did 4 tires at a time as to not allow them to cool too much between tires as I popped them off.