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If you want to remove the bubbles (this will save you money), you should get a flat, knife-like object (but not as sharp as a knife) or anything that will push the bubbles out. Just put the knife-like a few millimeters or centimeters away from the bubbles, then push the bubbles to the direction you wan't them to come out of.
Removing the screen protector is simple. Just simply peel it off. If you find it hard to peel it off, ask someone to peel it off for you.
Don't use any glue or anything, as it may ruin your screen. You should get replaced one. Or you can also try to clean the screen protector, then put it in place on screen, or use hair dryer which will cause it to stick to the screen.
No, they won't hurt the screen at all. The very reason they were invented and created was to protect the screen from scratches and dirt.