Self-repair depends on your skill and patience. If it's just the clear coat and a small chip, you can get a modelling paint brush and dab the clear coat into the cleaned chip, just proud of the surface (there will be some shrinkage as the paint dries). If the paint is a little thick to nicely apply, you can thin some down with alcohol in a bottle cap or similar and apply a few layers (thinner paint leads to more drying shrinkage as the solvents evaporate, so maybe make it a little prouder with a few more layers).
Give a week for the paint to not only harden, but cure as well and give the painted surface a hand polish with some slight abrasive polish (like Mer) until it is smooth and level with the surface. Gloss it all back up with some wax afterwards.
If the chip is tiny then a wooden toothpick may serve you as well as a modelling brush.