Not too bad actually. Habitrail needs to be loosened (2 nuts). Playfield is held in with 4 screws from the top. You will have to cut a bunch of nylon ties under the playfield to disconnect the wire harnesses (2 groups). Probably will need to remove a couple of the castle walls to get to the screws that hold the playfield in place. While you have it out make sure the door mechanism set screws are all tight as well. Most difficult part is when you drop a nut into it after reinstalling and have to pull it all out again