It seems my waterpump bearings are going. Making a grinding type noise at any rpm above idle. How easy (hard) would this be to replace? I have seen a few older posts about removing the top motor mount to get to it, but I'd like some other opinions. Its not leaking so I'm in no hurry (would be nice if I could hold out til spring), but sooner or later I have to decide: Do it or have someone else do it? Thanks for any advice.