Step 1: CAUTION!
Razor blades are sharp and can hurt you badly so be careful while cutting out pages
Step 2: Info
First if you are doing this for your first time ,make sure to have extra books you can use.
Step 3: Materials
You will need a couple of books for backups incase you mess up on the first one and a razor blade to cut the pages(I have tried to use other tools but the razor blade works the best.)
Step 4: Finally Lets Get Started
Simply draw an outline of what shape you want your secret compartment to be.
Step 5: Cutting the Outline
Once you have made the outline start to cut it out(only try to cut out 5-10 pages at a time.)
Step 6: What It Should Be Like
If you have a rectangle outline it should look like this
Step 7: That Is It
Here are some other pics of the book