I’ll just add 2 minor tricks that have worked for me: 1) use flat tire levers such as Schwalbe’s and use all 3, levering 2 in close proximity with the back of your hand then wedging the 3rd in where you can. The middle of the 3 always falls to the floor then which is OK but not dropping the other 2 without having them snap back or pinch a tube takes practice but is entirely doable.
2) Save your thumbs and hands by wearing snug fitting work gloves to roll that last bit of stubborn unmounted bead up and over.
Last edited by masi61; 09-04-20 at 12:37 PM.