its not very hard to do yourself mate.

Rocker cover off,
rockers off
lifters out (if your not replacing these then make sure they go back in correct order)
cam pulley off
2x 6 or 8mm bolts (cant remember) that hold it in situe.
distributor comes off then the cam comes out with abit of wriggling.


if you put everything on a piece of cardboard as you take it out, to make sure it goes back in the same place its easy. shouldn't take you more than 2 hours and thats going steady.