If you take it apart slowly and lay everything out as you pull the parts off then it will be a easy day consuming process that will be worth it. If you dont have a clean place with room to dismantle the trans or patience then you might not want to try it.
I pulled apart my samurai trans when I was 16 and replaced the syncros by myself and it wasnt that difficult. Granted it was a small, light, easy trans but a manual is a manual.