I found the following three videos most helpful:
YouTube - Porsche 944 Turbo Water Pump Change - part 1.wmv
YouTube - Porsche 944 Turbo Water Pump Change - part 2
YouTube - Porsche 944 turbo Water Pump and Belt change - part 3
I also found the following explanation helpful in setting up the balance shafts:
BalanceShafts
Beyond that, there are articles on clark's garage and arnnworx that will be helpful. I watched the movies all the way through, rerunning parts that I wasn't sure about. He covers everything pretty well, except maybe positioning the balance shafts.
It's pretty much the same operation turbo, or non turbo. 16 valve engines are different, though.
You're going to need a bunch of tools: a crank lock is an absolute must-have, and you'll need a 24mm deep socket to position everything to TDC, and to remove the crank pulley. I found a 34mm deep socket helpful in using the cam gear to adjust tension. A pin wrench is handy for removing the balance shaft pulleys, although there are other tools that would work as well. You can get pretty much everything you need from our hosts at Pelican. The 24mm socket should be no problem buying local. The 34mm socket is also available through any parts store, they're used to remove axle bolts. If you do the fan switch, you'll also need a 30mm wrench or socket.
I did the fan switch, belts, hoses, oil cooler gaskets, and the waterpump at the same time. It required a solid week of work, although the next time through I think the time would be cut in half.