You should be prepared for library visits and genealogical research trips by building a take-along tool kit.
Your took kit should include a small stapler [these are easily found in school supply areas of your local stationary or discount store], zip-lock sandwich bags containing different size paper clips and rubber bands, several sharpened pencils, a small pencil sharpener, an eraser, small notepads whose pages can be clipped to others, a notebook for the plethora of notes you will be taking, a zip-lock sandwich bag or coin purse with a variety of coins and dollar bills for copy machines and microfilm print printers. I also like to take along Post-It notes and Post-It tape flags [these are especially helpful when making notes to yourself as reference].
I hope this will help to get you prepared for you research trips! - cbh