No worries. There are many. many guests that need to be up and out early in the morning for early character breakfasts or early BBB makeovers. Fellow Panelist Bret has some great information on the early morning transportation situation at Walt Disney World. I'm going to refer you to his post here.
I will also add that I always have at least two early character breakfasts in the theme parks on every Disney vacation. I rely almost exclusively on WDW transportation on my trips. I have used the Disney buses and boats MANY times very early in the morning to get to my character meals with no problems. If you have any concerns, just stop at the Guest Services desk at your resort the night before your breakfast to double check the best time for you to be at the bus stop. They'll be able to tell you exactly what to do.
Once you get to the park, it is VERY easy to get inside for an early character meal. You'll go through the security checkpoint and then you'll see a big row of turnstiles. There will be one turnstile marked with a sign that says something to the effect of "early character meal entry." Usually the entrance is at the far end of the row of turnstiles. If you don't see it right away, just ask any cast member. When you approach this early character meal entry turnstile, there will be a cast member there with a clipboard. They will double check that you have a reservation. They look it up by your name, but have your confirmation number with you too, just in case. Then you'll be allowed to enter the park with no problem.
Have a great visit to Walt Disney World.