The simplest way to do it.
Go to
Disneyland or DCA.
See a photopass photgrapher, get their attention, they take a picture of you.
They get a card from their pouch, scan the card which associates those pictures with that card, they give you the card.
As you see photopass photographers during your trip, have your pictures taken by them, taking advantage of the fun poses the photographers come up with (look around the last few pages of this forum to find the various recent threads on fun poses and add-ons the photographers can do). They will scan your card each time.
If your party splits up, each group or each person can get their own cards!
Once you're done, if you want prints you can get prints at the photo centers at DL and DCA. If you want a CD of those pictures to take home (and the photo release which allows you to make prints of the pictures anywhere you choose), go to a photo center and have one made.
If you get home and want prints, do that online. If you want a photo CD from home, you can edit the pictures with fun borders and signatures (look around the last few pages again for examples, specifically some examples of mine in dopey's_mil's post, and even my Sept and Dec trip reports linked to in my signature), and order that.
Whew! hope that helped.