The clock is a 3 1/2" insert that requires a 3 1/4" hole. I used a hole cutter for the insert.
This is an easy pattern to cut. The only challenge might be the words. Use a small blade. I had a selection of jewelers blades that I use to make jigsaw puzzles. I used the #4 jewelers blade for the words.
You can purchase the clock insert form the Clock Parts banner below.