It's not a difficult DIY, especially if you've done brakes/rotors.
You need coolant, gasket (which you'll cut to separate the part for the oil pump) and the pump. Polyrib belt is optional, but since you'll be taking it off and putting it back on anyway, now's a good time to reset the clock on that item too. You are really only unbolting the old one and bolting in the new one w/ belt rplacement and coolant refill/bleed.
So far as the pump, the Porsche pump is not a very good design. It uses a plastic impeller and many of these have failed. It's almost always the bearing and seal which fails, hardly ever the impeller, except for the plastic ones used on Porsches and BMWs.
There are reman'd pumps available (everything is replaced - shaft, seal, bearing and impeller), only the housing is reused. In most cases these remans are built better than OEM using a metal impeller. Personally, I'd go with one of these before using the Porsche pump.
Start to finish I'd say 2 hrs.
