Drivers back side window won't stay up.

the repair process is not too complicated. base on your description seems that you will have a problem with the window regulator. this part is responsible to transmit the power from the power window motor to operate the window up and down. when it fails usually will bind not allowing the window to move up or down. but in your case it dropped the glass into the door. thankfully it did not brake. this is not a 5 min job with out the experience required i would not recommend you tackling it. this can cost in the ball park or $250.00 if you need we can assist you in repairing it for you. thanks