panel beaters are your best bet, if an amature tries to do it without a heatgun and proper attention to how metal expands/contracts and the paint sitting on it, it can lead to chipping, peeling and cracking.
rolling can be any one of these as its quite a generic term, this is how I call them... other people refer to totally different things, as there's not standard for this.
you can lip a guard, which is to fold the metal lip that sits parallel to the surface of the tyre in, to create a smooth metal surface that won't shred the tyre if the wheel hits it.
you can pump the guard, which is where you rework the metal in the guard to be wider through the use of sheet metal forming methods
you can flare the guard, where you pull the metal lip out (instead of folding it back up when you lip it) to again give you more clearance, avoid the lip cutting the tyre and to enable you to run a wider wheel/track.