Depends on the age/condition of the paint.
If you're game (crazy IMO) you can go at it yourself with a rubber mallet
If you can get your hands on proper tools then thats a better option. Dunno about needing to heat the paint.
Your other alternative is a professional.
Sungard in Myaree or Stuart from Dentcraft are the two names that spring straight to mind. Its not that expensive - compared to stuffing up the paintwork.
Didnt really answer your question, but I'd really suggest getting it done right.