I've never done this at WDW but I've done this with other hotels around the country. They typically don't need advance notice. Address the package to yourself and put the word "Guest" after your name, either in parenthses or after a comma.
It will also be helpful to write big on ANOTHER part of the box (NOT in the address area) your name again (and "guest"), your reservation number, and your date of arrival. They will know to hold it for you. Like I said, any decent hotel in America does the same thing.