Allow time for application and be patient (about 45 minutes). As others have said, follow the instructions carefully. Tip--Fold the top edge down, rather than trimming it. That gives you a ledge to hold down at the top of the pages and allows for easier lining up. If you accidentally catch 2 pages, c-a-r-e-f-u-l-l-y peel it away. The clear part that attaches to the page tears easily and does not always follow the die cut. Though they really look nice and made a huge difference in the look of my Bible, I will try a different brand in the future.
You have to really read the instructions, as they can be complicated to apply and the instructions can be confusing. They are really small but they do look pretty when they are all done. Bible pages are very thin and if not careful, you can get 2 pages together and it can be hard to separate once the tab is applied. I will recommend them but cautiously! Good luck!