step 1,,,,,,,,borrow a heat gun, apply heat, not to close, then start to peel with your nail, if you know any panel beaters,painters or house painters, they will have one, or buy cheap one from bunnings,
step 2,,,,,,use a wax and grease remover to remove the glue thats left on panel,
step 3,,,,,,polish, as will be a shade diffrence around where sticker was,
step 4,,,,go into panel shop, get them to do it, a sat morning best and slip them 10 bucks, only takes 5 mins to do if you have correct tools