My car maintenance skills extended to changing windscreen wipers before I did mine. I must admit that when I realised removing the sub frame would result in frame less door shells I was a little nervous, especially as it was very wet and windy. If you read the guide though it is actually really simple. You basically undo some stuff, change the clips and then do it back up again. I was quoted in the region of 300 (for both sides) by every garage I tried, so for a tenner on clips and 2 or 3 hours work I was well pleased. I must admit that I did book it into the garage in case it went wrong though - as I needed the clutch doing anyway I let them know I would be trying to sort the windows and that I might need them to save the day!