Anyway, assuming it's drywall and assuming the hole is 5" x 6" (not feet), go to Quick Fixes and instead of fixing a wall, you're fixing a ceiling. The only thing you want to do since it's a ceiling is definately cut the drywall back to the center of the ceiling joists on BOTH sides of the hole. Use drywall screws or construction glue to mount the template to the ceiling. Cut away any loose 'paper' off the edges of your template and the edges of the drywall still on the ceiling. Many thin layers of compound are better than 1 or 2 layers of 'thick' compound.
I hope you're up to this task. If you're hesitant, as a friend that's a carpenter, a painter, or an electrician. See if they can help. My best to ya and hope this helps.