Using this book is easy! Just open it up and start reading. It's full of great tips on how to win friends and influence people. As for handling it, be gentle when opening and closing the book to keep the tight binding intact. Since it's an old book with some signs of age like foxing, try to store it in a dry and cool place to prevent further damage. Also, avoid getting it wet or dirty to maintain its condition. If you want to keep the markings from the previous owner as a part of its charm, that's great. But if you're bothered by them, you can try using a soft eraser gently on the paper to see if they'll come off. Just remember to be very careful not to damage the paper.