Opening the watch like this is just bad and ridiculous advice!

Would not recommend to open it with a steel wedge in a 90 degrees angle.

Or are you guys going to sell screens hoping on some broken screens?

Only way, at home, is with a small enough suction cup. This is just stupidity.

If you manage not breaking the screen you are going to damage the watch anyway with this method.

Hire some engineers iFixit!