How easy to do are stem seals?
There's a guide in the MK2 maintenance section 
here
says i need patience. Something i lack of very much!!

also some tools which i dont have.
i think gettin the skimmed and doing valve stem seals by a professional is the wiser choice. just need to find an engeneering house near southampton/bournemouth that would do it for around £50.
also, for porting, are these any good?
click me!