It’s the west coast that makes the N500 so special, the eastern side is much less interesting. Comments about hotels fully supported, book very early if you want a choice. Route has been heavily promoted by the tourist board but the infrastructure to support it isn’t there. Many roads (despite being “A” classified) are single lane with passing places and most everything outside the hardtop is bog or close to it. Once the seasonal traffic starts it’s auto camper heaven and the procession moves at the speed of the slowest. Watch out for motorcyclists speeding down the outside, often in convoy, and cutting blind corners. Sheep are also an interesting hazard and can be relied upon to wander aimlessly onto the highway. Road condition after the winter can be pretty rough and it’s a long way to a tyre shop or windscreen repair. We found motorbikes especially bad for throwing up road debris and learnt to give them a healthy distance. Having said all that it is possible to rack up 200 plus miles a day comfortably if you use the roads in the interior and we found that staying in Inverness, where there is a good choice of hotels and facilities, and basically daytripping to the coastal areas with a couple of overnights at the very top of the drive worked well for us - remember you’ve got a lot of daylight after the equinox. Also gave an opportunity to enjoy the car more. Consider a detour to Orkney for a day or two while you are up there. Petrol stations are few and far between as well, so make a point of topping up when the opportunity presents itself - often small unmanned stations in villages. Oh, and a lot of facilities are closed on Sunday. A big plus for those of us who are a little older is that there are plenty of public toilets, just as well as the countryside is mostly wide open.
The scenery is absolutely stunning but you do have to hope the weather will be kind. Take a decent camera with a wide angle lens (Leica Q highly recommended) and plenty of memory cards.