Examine the door's hinges to see if the nailing fins are accessible.
Unscrew any nailing fins from the door that are making it more difficult to open the door or to get to the hinges. If the nailing fin was nailed in, the back of a hammer or needle-nose pliers will help you pull the fin off the door.
Unscrew the hinges and remove them from the door frame.
Pull the door off the frame.