Bulletin boards...you love them or not hate, but tolerate them. A tried and true tip to make it easier is to use wrapping paper or twin flat (not fitted) bed sheets.
I like using sheets because staple holes don't show, which means I can reuse them year
after year. You can pick up sheets at second hand stores or during back to school sales :)
Just make sure you buy flat sheets not fitted ones!
Also, borders are super cute and can be super expensive, so laminate your borders before stapling them up!