Snapping them back on is easy.
Removing them is basically asking for them to snap. Each time you remove it, you're applying stress that if it doesn't break now, it could totally break later. I suspect either you're gonna be so gentle that they aren't going to come off, or you're always risking snapping the bar the keycap grabs onto.
I foolishly watched some video where some guy was all this is how you do it, no worries, I never broke one.
If you thought of the scissor switch bars as handle bars, I'd say a left to right or right to left pulling, etc. is more like trying to slide the handle bars out, rather than forward backwards which would be like trying to bend the handle bars of a bike forward or backward.
Just stick with error. Thankfully, I wasn't the one paying for them to replace the keyboard in my laptop . . although that's an easier way to clean it:spy: