Chris,
this is a relatively easy job to do if you have the right tools. You've done a gearbox already and that is way more difficult/scary.
A new boot kit from VW is about £15 to £20 and comes with all the right bits. Some aftermarket kits don't.
1. take the centre cap off your wheel and loosen the driveshaft nut/bolt with the car on the ground. DO NOT DRIVE OR MOVE YOUR CAR NOW. It could damage the wheel bearing. Alternatively loosen the nut/bolt after you've jacked the car up and put it on axle stands by getting a mate to stand on the brakes real hard.
2. from underneath the wishbone mark the profile of the wishbone on the balljoint, or spray it with some paint, so that you can line it up again near enough where it was. Now remove the balljoint bolts from the wishbone.
3. get a hub puller and fasten it to the hub so you are ready to press the outer cv out of the hub.
3. slide the balljoint out of the wishbone, being very careful not to damage the rubber balljoint boot on the wishbone as it comes out. This is a bit of a pain as you have to push and pull the hub around abit to get the balljoint to come out of the wishbone, but it is possible.
4. you now have a choice as to wether you want to remove the whole driveshaft or if you want to try and remove the cv joint/ boot in situ. I recommend removing the shaft, its alot easier if you have the whole thing on a bench. if you choose to take the whole shaft out, then you now need to remove the bolts at the gearbox end.
5. now using the hub puller, press the cv joint out of the hub. I recommend using a hub puller as it is very easy to damage the threads on the cv joint if you try and whack it out with a hammer, and it doesn't do the wheel bearing any good.
6. take the shaft to your work bench and cut the old clips and boot off. have plenty of rags as there is a shed load of grease. Clamp the driveshaft in a vice and whack the outer cv joint with a soft faced hammer on its outer edge and the cv will pop off the shaft(see picture below).

7. replace all the bits on the shaft with the new ones in the kit(check the sequence in the picture below), fit the new boot, grease it all up, put the new circlip on the shaft, tap the cv back on and put on the new clips.

8. now put it all back, and don't forget to torque up the driveshaft nut properly.
9. job done.
If I have got anything wrong or forgotten anything then I apologise. I'm sure someone will correct me.