I've restored some church pews
Mine have a separate seat and back so a circular saw can be used to make the 45 degree cuts with a straight edge guide. You can either cut them assembled as a pew or take the back and seat apart and make separate cuts. Since I was refinishing them, I took mine all apart.
The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
Last edited by woodnthings; 11-21-2013 at 07:32 AM.