The best way to drill a hole is to start with a small drill part and work your way up. As you’ll be pressing down through the book to make a hole, you’ll need to do it on something you don’t mind getting a hole in it incase you go too far! Some old magazines will do the trick should you not have a proper workspace. Make sure to stop frequently to check how deep you’ve gone.
Work your way up the drill parts till you’ve made a hole with a big enough diameter to fit the clock post through. This part takes the longest, but it’s worth taking your time over – you don’t want to make it too large or the clock mechanism wont fit.