As a complete Car mechanic Novice, I thought I'd share my first real experience of sorting something on my van!
This is an idiots guide to removing the throttle cable for lubrication or replacement on a 1.9TD as they often get extremely stiff. The difference even lubricating makes is amazing! So I would try this first before replacing.
1). Working from the end of the cable which fastens to the engine, unhook the Red section of the cable seen the picture below from its holder.
2). Pull the very end of the cable off where it fastens the the engine. This pulls upwards towards you.
3). Take the cable out of all its holders around the engine.
4). From inside the cab, get your head under - near the peddles. You will see that on the end of the gas peddle there is a hook that clips onto the end of the peddle. Undo this and then you will be able to pull the cable out in the engine bay.
Its in the top right of this picture
Finally just undo the electics that fasten to the cable and you should be able to pull the whole cable free.
5). Either lubricate with a fine lubricant (I used GT85 which I use on my bike cables when they're getting a little stiff), or replace the cable completly.
My first try at a "How to" photo guide aswell. If it helps someone to get their trottle cable