I do this with Alt cap on both sides removed:
- use a keycap puller and hook both wires around one edge of the spacebar with one hand
- put the other hand or a finger on the spacebar, while applying light pressure
- pull the side up until it pops off the stabilizer stem
- pushing down with the other hand prevents the keycap from bending or breaking the switch stem or the other stabilizer stem to which it's still attached
- repeat the same on the other side
- now the key cap should only be attached to the switch stem in the middle
- pull the keycap off with my two index fingers while resting my thumbs on the bottom edge of the case
At this point the spring around the switch stem usually jumps out and then I'm searching for it on the floor for the next few minutes
