depends on location of the alternator but usually not hard at all, remove the belt, remove 2-3 bolts / remove wires to alternator first tho before hand.. also disconnect battery first
Yeah... just disconnecting, battery first + & - , remove cables from alternator, remove belt, remove all bolts and bracket if there is one on it (depends on where its located to make it easier to mount back up) repeat process in reverse to install new alternator