How easy is it to replace a water pump on a 1986 nissan ?

Well I am going to help a friend out by replacing the water pump on his 86 nissan pickup, I have not yet worked on this truck motor before and not be able to see it until a few days from now. I can pretty much replace anything on a motor that's easily accessible for me, just don't ask for the cylinders to be replaced, that I wont do.How easy is it to replace a water pump on a 1986 nissan ?what model is it there all different most of the time its not hard to do get the bets off and unbolt it clean up the old gasket and put the new one onHow easy is it to replace a water pump on a 1986 nissan ?buy a new ford