The driver side window wont roll up completely. I

The driver side window wont roll up completely. I think there is something stuck inside the door preventing the window from rolling up. It rolled up 3/4 of the way and then stopped. I rolled the window completely down & slammed the door trying to loosen whatever is stuck. I was then able to roll the window almost completely up but it still stops almost 2 inches short of closing. How can I remove the door panel so I can remove the foreign object?