i actually changed the belt myself. While you at it the tensioner pulley needs to be changed as well as the crank oil seals & camshaft oil seals.
nissan quoted me R3000.00 to do this. the parts came up to R300.00 or so. It's actualy not a difficult job. the only difficulty I had was the crank bolt. It looked like the previous owner crosse threaded it before.
I let a buddy(machanic) do it for me on saturday, R250 for his help, R190 for the cambelt and all v-belts plus seal, tensioner was still cool according to him.