The AP comes with several pre-loaded over-the-shelf maps that are designed to give your car a basic "tune" depending on the mods you have... there are stage 1 and 2 preloaded maps depending on your level of modification. These are in no way professional tunes, they're generalized tunes from Cobb that are designed to keep the car running better with your mod level until you can have a professional custom tune your car.
The Dashhawk has no tuning capabilities whatsoever.
You won't be messing anything up with the AccessPort and it's not something you change frequently. You save the stock map, flash the new map, and you're good to go. If its something you're worried about, take 5 minutes to reflash to stock when visiting the dealership for maintenance, and then flash back to your stage1/2 map. Your custom map will load up the same as the preloaded maps and is available under the list of maps on the device.