Tips for getting tires off the rim?

[COcheesehead]

One good tire lever and a wad of spit on the end of it. Insert under the tire bead and push it around the rim. You can thank me later.

[NORTY FLATZ]

Be sure the tire beads are in the "valley" of the rim, side opposite you're working on. This will give you room to get the bead over the side/edge of the rim. Some use soap, some use "tire lubricant. I use "talc." It also helps to be careful when you're prying the bead off/onto the rim. This is where "pinched" tubes happen.

[CCS414]

Soapy water and strong hands.

https://www.youtube.com/watch?v=cTAqUAPBfl0