Replacing screen fabric is so very simple.. Getting the screen frame out of the window is often more difficult. You pull the rubber spline out with whatever you have, (screwdriver, butter knife etc) lay the new screen on and use the roller tool they sell for $5 to roll in the new spline. takes 15 min if you're new to it and 5 mins if you've done it a few times. there is a bit more to it, but youtube is your friend.
A glass place should fix it for you.
No . Even if they did you should not trust them to do it right . You can buy new full frame screens there
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