If your car is as bad as you say and you achieve 90% with a DA and some instructional vids I will literally give you a job should you ever need one......I'm not even joking.
You should definitely have a go though. It's very satisfying to do and with a DA is extremely difficult to do any damage (albeit not impossible)
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mine isn't quite as bad as he OP...i did have some nasty tick marks on the boot lid (not put in by me i hasten to add) which i managed to remove over the weekend.
i do agree, it is rather satisfying using the DA,especially when the results appear so good.
Ricey....don't think i would want to do it for a living!!