Is it hard to replace sync. on 05saturn vue 5spd man. trans.?

2005 saturn vue, 5 spd man trans, need to replace syncronizer, grinds tring to get in reverse, most times it wont go in(i end up pushing), occasionally a slight grind going into 5th yet always goes in 5th. how much will it cost to do myself vrs a mechanic, how complicated on a scale of I-10? thanks