I take off my hat to MigV6, I have never mastered changing car tyres. I can do it on pedal cycles and motorcycles, if I could not I would not ride them. On cars I change wheels, and the Omega still carries a full sized proper spare allowing me to proceed at full speed, like all cars should do.
I have twice in my life tried to master changing car tyres, and failed on both occasions. Problem was getting the tyre down from the rim into the well. Tyre shops use an airline tool for the purpose, with the wheel clamped on a rig. I bought a Machine Mart tool I can bash with a lump hammer to get it off, but still failed, so gave up.
Do all tyres on wheels really need balancing? The wheels seem pretty symetrical, just a hole for the valve, the valve is obviously an out of balance, and that's it. I believe tyres have balance spots on them to align with the valves. I never used to balance my bicycle wheels, but they were bigger. Come to think of it, I don't think balance was a problem on older cars. Could it be more of a problem on small wheels, as on Minis?