They are held on by clips and do break easily... I found it's best to warm them up with a hair dryer (you'll have to borrow your mates again... ) The extra warmth makes them slightly more flexible...

Are you going for a vinyl wrap or sprayed?

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His:
BMW Mini Cooper S Black and blue all over
Seat Leon FR 2.0FSI Turbo

Hers:
Fiat 500 White and Kitty all over