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Thanks for all the tips. I see what you mean with the corner one, it took a bit of puzzling to get the right parts together to loosen it (I used a socket, one of those angle things, a short extension and the ratchet, all 1/4").
For others, be aware that there are two different lengths of bolts used. I didn't notice on removal so could only try long one first for each hole and replace with short when too long. Also, cutting the gasket in-situ wasn't that easy. I ended up cutting the gasket in smaller pieces first so I could use the good old metal fatigue to 'cut' it. New one was easy. Also, the pump came with two foamy gaskets (one for the main pump, the other for the elbow). I couldn't really see how to get that to fit together, trying to put the small gasket in place while finding the hole positions etc. So I was happy to have a steel one which I ordered before.
Still, it took me two hours from starting to drain the car to having everything bolted together. The belt is not on yet, system not filled, covers not put back. So probably another hour to go.
The pump which came out is busted indeed. Significant movement in the shaft (wobble), so I am confident this was the source of the leak and happy that it did leak as it was on its last leg. Also happy that I didn't want to run the car anymore even if the leak was small. Last year I checked all pulleys and found the waterpump to be ok, so I guess it was the short belt that put too much strain on it (it might be tighter in other spots than then one I put it on). The longer belt should help here and if I feel this one to be a bit short as well, I'll be sure to get it right before putting miles on it.
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