One method to find the DDC/LCC classification numbers is to join Librarything.com (free membership). When you add your books to your collection, it includes the DDC & LCC numbers. You can also sort your books by DDC or LCC, if that is helpful.
Once you have your books organized, you could follow my library's practice (for patrons): make a cheat sheet with the general categories and their call number ranges (i.e. meat, vegetables, cooking by region/ethnicity; baking).
My books are organized by LCC, for the same reason you give.