Dear Jason: What Mike has told you is just about on the money. There are remodeling cans available they are also known as 'old work ' cans. Do make a small hole, use a hanger because if you hit a beam or some other obstruction you can fix it with just a little joint compound without having to have to paint the whole ceiling. If you tap around and push firmly on the drywall ( assuming the ceiling is drywall ) you could usually find where the joists are. Take your time with this project....make sure your splices are good. Goodluck .... any questions write me here and for a faster response email me at CHOLE4ELECTRIC@aol.com Take Care Christopher