try ... try ... and try again ... That is the way to do it .. and when you finaly have succeeded in modelling something cool, then its time to texture.. and here it all repeats itself .. Try ... try .. and try again !!! .. wooohooo a good texture.. now its time to do cool lighting....... try..... oh man..

To get back to the tutorial part, then you should look in the learning Maya Manual .. it has some good basic tutorials on nurbs modeling ..