The local Autozone type places sell Water Pumps for Mercedes; at least for the 617.952s.

Without having the Water Pump in Hand it is hard to say if it is possible for some on at Home to rebuild it.
You usually need a Hydraulic or Arbor Press and on some Pumps the Bearing is press out through the Front.
The problem with that is there is ofte no way to Pull of the Impeller so you end up pressing on the Pump shaft and hoping the Impeller will come loose when you reach the Housing.
What ofen happens is the Impeller cracks.
That is not a big problem if you have some sort of Kit that has a new Impeller with it.

I have not seen any such Kits for a 617.952.

Also pressing something out of a Water Pump with an Aluminum Housing with out the proper sized tools to do so can damage the Housing.

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84 300D, 82 Volvo 244Gl Diesel