First prize the plastic cover on the inside of the door carefully.( easier with the door fully open) Manouvre it over the adjusting handle. Using a screw driver remove the bottom screw first (put your finger under the screw to prevent it from falling between the door panel) Remove screw that is away from the windscreen next and then the remaining screw. Pull the old mirror away.
Before offering up the new mirror - take one of the screws and gently screw about half the length into each plastic leg inthe new mirror housing ( this gives you a starting thread for when you screw the new mirror on).
Offer up the new housing.Fit the screw furthest away from the windscreen first then the other two in any order. Replace the plastic cover. Finished. The whole job takes about 10 minutes.
B Pope
July 2013