it is quite straight forward, do it in a warm place though other wise the plugs snap as they get brittle in the cold. you will need to undoe all the visible screws and bolts. This there is one under the door handle and a coupe under plugs in the grab handle. The panel then pulls off a number or plugs arroanged around the card. I have done it a few times on my 155. Just be patient and make sure you have found all the screws amd bolts. remember dont do it in a cold place may be worth waiting a couple of months . also remember to unplug the electric window switches, it is just a push fit multiplug.