Count your books. Re-count if you feel uncertain, then record this number and alphabetize your books by the authors' last names.
Create a database, spreadsheet or other document with the following columns: last and first name, title, publisher, year of publication and any relevant facts or tidbits associated with a particular book.
Input your books into your document and search for Library of Congress or Dewey Decimal system cataloging information for each book. Add the cataloging information for each book to your document.
Check the number of books that appear in your document against your earlier count to complete your inventory.