If you go through a TA, you'd only need to make one phone call - but you'll want to do your own research. For instance, the previous poster stayed at the Swan - a lovely hotel, but is it right for you? Some travel agents are equiped to help you make these choices, others have never been to Disney, or at least don't specialize in it. A
travel agent specializing in Disney would be a better choice if you don't want to do your own research. Also, a TA might not get you the best possible rates on things like rooms and hotels. TAs have their own interests as well as yours in mind when they help you book a vacation - you never know if the rental car agency they recommend is the best for you - or merely the one offering them a promotion for bookings. Most people around here think they do better - particularly with the land portion of the trip - booking themselves - both financially and in the amount of control they have to weigh each option. Try
www.mousesavers.com and you'll start to get an idea - rental cars, airfare, hotels, etc. We booked our cruise through DU (the sponsor of this site that specializes in Disney travel) and saved a few bucks over booking through
DCL - but DU didn't seem interested in upselling us airfare, hotel, and the other add ons - we booked those ourselves.
A UPH gets you admission to all Disney venues from check in to check out. But if you don't fly in until 3:00 in the afternoon and the parks close at 6:00, and you leave for the boat at 10:00am, you aren't really using two of the days you paid for. A Park Hopper gives you X days of admission to the parks - and with longer hoppers a few "plus" admissions - waterparks and admission to Pleasure Island. UPHs need to be bought through Disney as part of your room or package - hoppers can be bought through discount ticket brokers, so in addition to the benefit of dropping days, you can sometimes save a few bucks...once again, check out mousesavers.