Before you head out to Disney, address your concerns. There is no point is going to a resort that you are already anxious about. Make a list of your concerns and phone the resort. Switch to a resort that will make you happy before you go. Otherwise, contact the resort to explore your options.
To switch resorts while at Disney you first need to speak to your consierge deck in your current hotel. They will then search available rooms in the hotel of your choice. If a decision is made to switch rooms then bell services will move your bags to your new room.
Your ability to switch will most likely depend on availability in other resorts. I also believe that if you do not cancel within a certain amount of days before your trip, you will be obligated to pay. I would check with your resort to see what their cancellation and satisfaction policies are.
I used to work at Disney and they have something called service recovery, they want to make the customer happy at all costs. If rooms are available they will switch you but charge you if there is a difference in price.
You can switch if you are unhappy with your resort. I would just mentioned to the front desk about your problem, and if they are willing they will be more then happy to mentioned another resort for you. Or you can just reserve the resort for one night.