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replace a valve seat in bathroom shower?

The shut off valves in my shower are leaking. I have replaced the rubber seal several times but have been told I need to replace the valve seat that it seals to. how is this done and how complicated is it? Is it possible to drop the replacement down inside the valve and make matters worse? What special tool is required for this? Thaks for your help!
Terry Kelley, April 2007
depends what shower it is.

hi-spec plumbing, April 2007