Want a tip?
Get an empty water bottle...you know, the plastic pint ones?
Fill it 7/8 full of warm/hot water, poke a 1/8 in. hole in the screw top.
Fill the rest of the bottle with your favorite liquid dish soap...I have found Polmolive works MUCH better than others!
Air down the tire, give the bead a good squirt of the soapy water mix and walk away for 5 mins, or, do multiple tires.
Go back to the first tire, lock ring up, on a piece of mud flap or carpet and use a good duckbill on it. After that side is off the bead, flip it and do the same to the other side.
I learned this trick from an old guy and it has worked very well, even on tires that have been on the wheel for 20 years.
I can get a tire dis mounted in about 5 minutes...even old ones.