Can I really pull this off?

So we went out to dinner with some friends and ended up talking about taking a trip just the 4 adults to DisneyWorld. The recommend we go in May & I responded I can't because I am running a half Marathon in May at Disneyland.  So I countered w/ January & then she said no how bout February? I think thought: WAIT isn't the Princess Half Marathon in February????  Sure enough, it is. All of a sudden I am insisting we plan our trip around this event and I am then thinking wait I am nuts. I was planning on my 15K in March not a Half Marathon in Feb.  But if I complete this & stick to our plan of Disneyland and the Tinker Bell Marathon I will qualify for the Coast to Coast Medal. So not only 2 shiny Disney medals but 3!!!  And if we are going to Disney World anyways why not. This feeling is then followed by the feeling of being sick.   I asked DH if he'd run the princess w/ me cause for my first half marathon I am not sure I feel like I could do it alone. I was excited that my first half was going to be at Disneyland, my favorite place, w/ my BFF.  Two ideas about this drive me crazy. Idea 1. Doing it by myself & Idea 2. Going but not doing it when I had the chance.  I feel like if we really are going to DisneyWorld, no kids, and I don't do it when I had the opportunity to I will regret it until I can complete the coast to coast.  The fear of what if I can't complete it was getting in my head. They require you finish it in 3 1/2 hrs so a 16 min mile pace.  And they say you need to plan for photo & bathroom stops.  So I would love to complete it in 3 hrs which is just under a 14 min pace w/o stops so maybe I can get to a 12 min pace to compensate for the stops.   The training plan for beginning runners on the RunDisney website says it is a 14 week training program.  I have 32 weeks until that day.  I have double the time required to complete the training. Realistically if I have plenty of time to pull this off. Here is the catch. Registration for this is Next Wed. A week away! So I have to decided and because these things sell out like in hours I have to be serious about my decision quick. *GULP*