Cars & Driving
Difficult in the city, great in the countryside
For any trip longer than a few days driving is the probably the most convenient way to tour Scotland.
Rentals
Rental car booking can often be most easily done via a price comparison site like Momondo. Prices starting at around £140/week for the smallest cars, but some rental companies will try to scare you into paying as much again to remove a £1,000 excess (deductible) from their cover (or force you, if you can't pre-pay the amount on your credit card). Note though that this excess can also be effectively removed using the services of a third-party such as Insurance4CarHire, if your credit card doesn't already provide this cover. Whatever you do, don't forget to factor in fuel and any city-centre parking as both are expensive.
Driving
Otherwise driving rules in Scotland are similar to many European countries – except, of course, that you drive on the left. Note that Scotland's drink-driving rules are particularly stringent, so it's best not to drink at all if you're going to drive.