Copy pictures and movies from memory card

I'm completely new to Hazel and trying to create what I thought would be a fairly simple rule, but I feel like I'm missing something. What I'd like to do is: when an SD card containing a "DCIM" folder is inserted, move all the pictures and movies into a folder on my Mac, with the folder structure named according to the date the picture was taken.

Here's what I have so far:
If:
Kind is Image or Kind is Movie

Do:
Run rules on folder contents
Move to folder Pictures
Rename with pattern "YYYY_MM_DD"
Sort into subfolder with pattern "YYYY > MM"

Which mostly works, but if I import twice on the same day, I end up with one folder named "2012_11_20" and an additional one named "2012_11_20-1". Is there any way to sort into an existing folder, or is there some part of this I could be doing better?

I suggest you (re)-read the sticky article on subfolders as I don't think this rule will work. In particular, "Run rules on folder contents" only applies to folders, not files, which your conditions are matching.

I actually does work except for creating multiple folders if run more than once a day, but as I said I'm open to suggestions for improvement since I'm new at this.

It may work, but again, not correctly as you are still posting here

Follow the advice in the article. You are combining rules for two different things.