Being a bit worried myself about using a clay bar I bought the £10 one from Halfrauds, cut in half, lots of lube (car shampoo and water in squirty poundshop bottle). Took me 2 hours to do the whole car and Well chuffed to say the least. Good soapy wash afterwards, complete dry and then polish.
Have heard a lot of good things about the products and folks from CarKandy so think I will be investing in them shortly.