How do I replace 4" recessed lights with 6" recessed lights?

Question:How do enlarge the existing 4" hole to make a good fit for the new fixtures?
Do you see any issues with the larger diameter recessed lights?
I cannot find any IC remodel 4 inch lights therefore I have to go with 6 inch light. Plus the bulbs are difficult to replace on the 4 inch lights.

Answers:
You're just going to cut the power to them, then take the 4" out and use a drywall saw to increase the size of the hole to fit the template that comes with the new ones. Then just rewire and pop them in. It's about a 10 minute project per light.