64 Tip
If you're learning with a 64 note chromatic harmonica, I find it useful to scratch the 12 hole equivalents under the numbers with a file. For example: scratch "1" under the 5 hole of the 64, and so on. Like the diatonic, eventually you won't need to look at the hole numbers. But especially with 16 holes, I find this useful to prevent getting lost as easily. Additionally, I've scratched little arrows over the top of the 5, 9, and 13 hole to keep track of octaves. Sure, it's defacing your expensive chromatic but hey, you're sticking it in your mouth not going to a fashion show.
-Taylor