While it's not a complete writeup, look at the procedure for camshaft removal. Instead of removing the camshaft bolts, just remove the head bolts. http://www.myturbodiesel.com/1000q/multi/camshaft-inspection-replace-VW-TDI.htm There are articles on how to do the timing belt and how to put the lock carrier in the service position linked through it.
You also have to remove the intake air box, turbo support bracket, turbo oil drain line and supply line, and a few small hoses on the back.
When did they replace the timing belt? So the water pump broke and the engine overheated?
As a first step, I suggest putting the new water pump and timing belt on. Check compression and it could show where a leak is. Or do you know that the head gasket is blown? After removing the head check for warping.
And check the number of punched holes on the head gasket - they are 1, 2, or 3, you must buy another gasket with the same number of holes or compression will be off.
You also have to remove the intake air box, turbo support bracket, turbo oil drain line and supply line, and a few small hoses on the back.
When did they replace the timing belt? So the water pump broke and the engine overheated?
As a first step, I suggest putting the new water pump and timing belt on. Check compression and it could show where a leak is. Or do you know that the head gasket is blown? After removing the head check for warping.
And check the number of punched holes on the head gasket - they are 1, 2, or 3, you must buy another gasket with the same number of holes or compression will be off.