Dead easy mate!
The only real problem is the front top mounts, if you can get those undone then its plain sailing.
It's a pretty easy job really.
The biggest problem I had was the bolts at the bottom of the struts were completely seized. I had to use an angle grinder to cut them off then order new bolts from VW which took a couple of days. For the top mounts a 7mm allen key and a 22mm(or 23mm, can't remember) socket with a pair of decent mole grips should do the job.
It's probably easier with 2 people, always replace top mounts along with suspension otherwise you'll find that they will fail shortly after. Make sure you take note of how the top mounts/bearings fit together when you take them apart because you'll have to rebuild them after.
The rears are a lot easier than the fronts simply because of the top mounts so if you've not done it before i'd suggest starting there. If your worried about supporting the car, as long as you use axle stands correctly you shouldn't have any problems.
If your going mega low bear in mind you'll have to remove the jack afterwards, so it might be worth using planks of wood under the wheels to raise the overall height of the car a little bit.
Grease the struts/springs before you put the wheels back on otherwise you'll find that they will seize overtime and you'll get horrible creaking with cheap coilovers.
Thats about it I think!
