Removing keycaps might seem simple, but there’s a right and wrong way to do it.
First, make sure you have the right tool. Don’t use a plastic keycap puller, a butter knife, a bent paperclip, or anything that’s not a proper wire keycap puller:
Anything other than a tool like this, and you risk scratching or breaking your keycaps. Check the Buyer’s Guide for information on where to buy keycap pullers.
Second, make sure you have the right technique. Place the wire loops on opposite diagonal ends of the keycaps, and wiggle back and forth while gently pulling up.
Don’t put the keypuller square on the keycap, and don’t yank straight up without wiggling or you risk dislodging a stabilizer or even pulling a switch apart. Also, if you have a PCB-mounted keyboard, make sure you’re pulling on the keycap and not the switch itself!