If you've got this book, you can read it just like any other book. Find a cozy spot, sit back and start exploring the knowledge inside. As for handling, be gentle when opening and closing the book because it's an old one and the cover has some wear. When not in use, store it on a bookshelf in a dry place to avoid further damage. Don't expose it to direct sunlight for long periods as it might cause more darkening of the pages. And if you want to protect it from dust, you can use a book cover.