dont know anywhere in your are, the test is about £120 and you need a couple of days lessons at around £100 upwards a day, its about 3-4 hours of lessons a day. you just need a driving licence and some places you need to take your own 4x4. where im doing mine you dont need a 4x4 to do it.
Test and lessons will cost about #500, as missbuffay said. It's pretty much impossible to pass the test without at least lessons -the mirrors checks etc you have to do are exact and different from normal car driving. Well worth getting a normal car lesson before hand to brush up your general driving too - it will be way worse that you thought, as I discovered