OK, here we go, let's start with a few general thoughts:

Accommodation:
* You'll find pretty much everything in Scotland, although a lot of the best places are likely to be fully booked by now. If you already know a place where you are planning to stay I recommend to book as soon as possible
* If you're flexible I recommend the "book a bed ahead" service by the tourist office. Go to a tourist office, tell them the area you want to stay in, type of place/room, how much you'd like to spend etc. For a small fee they'll search for you and make the reservation, usually within 30min or so (while you visit some tourist attraction, do your shopping, whatever). I've found quite a few excellent places through it, only very few places that weren't great

Driving:
* keep in mind that the roads are typically quite narrow and that you won't find many straight stretches. This will slow you down (in addition to all the other stops you will make for views), so keep that in mind when planning how much you'll drive in a day
* you are very likely to encounter some single track roads (well, if you go to Trotternish on Skye you definitely will), which will also slow you down. If you drive slow to enjoy the sights make sure you let the locals (or faster drivers) pass at the passing places. Also you should stay on "your side" of the road (i.e. the left), even if you arrive at the passing place first (at least that's how I learned it).
* be glad that you won't encounter as many roundabouts as down here in England ;-)

Equipment/things to bring
* remember that we don't have Euros over here, so be prepared. Some friends of me only remembered the same day to change some money ;-)
* if you bring your laptop, you'll find WiFi in Glasgow and Edinburgh and some other larger places. Apart from that you'll probably struggle. Mobile phone reception depends on which side of the hill you're on ;-) You can get excellent reception in the middle of nothing much but nothing in the village three miles down the road
* if you plan to go walking, make sure you have the right equipment. Decent walking boots are a must, proper rain clothes in a backpack strongly recommended. The ground can be quite rough and the weather can change dramatically very quickly. And you don't want to be stuck in the middle of nowhere in torrential rain when you started in brilliant sunshine (or the other way around without any drinking water). I've experienced it multiple times (both ways), luckily I was always prepared.
* I assume you'll bring a digital camera, remember to bring enough batteries and have them charged. In some of the more remote places you'll struggle to find emergency batteries and by then the photo opportunity is probably gone.
* be prepared for the midges ;-)

That's all I can think of for the general part. Oh, if you read/use travel guides, I would suggest the Rough Guide Scotland.