IF you stay at the Hyatt upon arrival, for that first night, you will just head over to the B side of the terminal, in the morning, and go down to level 1...ground transportation. Very easy. As long as you have your reservation made, you're good to go. If you are taking DME back to MCO, and staying at the Hyatt for your last night, you will get the DME bus at BW...I think that's your last resort, right?? If you take DME to WDW, you don't have to worry about which bus...you will be put into the appropriate bus line for your resort whenever you show up. For the ride back to MCO, you will be given a particular pickup time, from the BW. You have to be on that particular bus.