Other than auto, I change all my own tires.... lawn & garden, bicycle, even changed a rear tire on my backhoe once. Small tires I break the bead by stepping on them, larger ones I use a sledge hammer. You are not allowed to hit the rim! Once in a great while I'll use my wood splitter & chunks of two by fours. First, remove the valve stem. Don't put it back until you are ready to inflate the tire. Tire irons and large screw drivers are a must. Dish soap & water makes for good lube. Always start at the stem when removing, and end at the stem when putting back on. The edge of the tire away from the first tire iron must be pushed in the center of the wheel. That's what gives slack to allow it to start over the rim. Here's a pretty good u-tube video: https://www.youtube.com/watch?v=ZlePZIlRG4c
I got a kick out of how he talks about not telling how much pressure it takes to seat the bead. Even I have to say never put more then the manufacturer recommends, but I personally never put over 80PSI in a NEW tire....used ones less. Do not have your body near a tire when it's heavy on air....ever! I have let one set for 10 minutes at 80 before "POW!" it seated itself.
For my lawn & garden stuff I buy tubes and use nitrogen to fill 'em. With nitrogen they stay inflated 6 months easy.
I don't use slime any more. Yuccccck. If you ever change a tire that has slime in it I think you'll shy away too....but... lot's of people have good luck with it.