With acceptance that many people will recoil in horror at the thought of DIY highlights at all and even more so if using a cap... I have a fringe. I am planning to do highlights with a cap. I cut my own hair, I dye it, if it all goes wrong I am fine with whacking on a dark dye or embracing a mad curly look whilst a dodgy cut grows out. I can live with mistakes. I still would prefer to avoid mistakes if I can! So... any advice? Ignore the fringe entirely? Pull just a very very few thin strands few? Go for it as if it's just any other section of the head?