For a gift I received a Lincoln Penny book, 1975-2009.
A couple days later I started filling the book. Out of thousands of pennies I took several handfuls and laid them down next to my book. I started placing them in. The first four holes were rather challenging in that I had to force the pennies into place. But then I started a new technique that involved picking up the book and then placed the penny in with my thumb.
After a while it became easy to put them in. The first day I managed to put in 34 pennies. The second day (tonight) I ended up with 50 in the book.
I am only having trouble with one year of pennies and that's 1982, due to all the different metals. I don't understand how to tell the difference.