i disconnected the electrical plug, and the two water pipes, then sprayed it with WD40 (poked a small screw driver under the rubber straps to let the WD40 get right in) and left it a while.
it will then slide out of its mountings (with a bit of wiggling) toward the drivers wing
id connect the new one up before u fit it all... as i did this all the other day, fitted the new one, started my car and the new one was really loud and sounded like it was going to blow up!! im now waiting for another one to arrive so i can fit that :s