Well, step one would be setting a budget. How much can you afford?
Step two is get our your calendar and pick the dates you want to go.
Once you have those figured out, then you can start with other things. I prefer the Disney Hopper Passes, because they don't expire and allow you to do what YOU want through the parks. I also prefer renting a house outside of Disney rather than staying in the park. They tend to be cheaper and because they have laundry & kitchen facilities right in the house, which helps you save on those costs too - you can just cook breakfast and whatnot instead of going out...
I planned an entire 14 day Disney/Universal vacation for just $3500 (but that was only for 2 people) but that did include food and shopping... It CAN be done, just know your limits and wants...
at 11:42 AM on Oct. 3, 2010