It isn't difficult to install.
The amount of noise produced is dependent on the size and speed
of the fan, and, indirectly, the size of the radiator.
You can use a large radiator, from a motorcycle or one made specifically
for the task, and get away with not even using the fan, except for under
heavy load, producing a nearly inaudible system. Or, you can use a few,
larger fans running slowly, which would lower noise. It is also possible to
run
the waterlines to a radiator that is in a different room or basement,
producing
no audible noise in the computers' room.
Dave