I agree that if they have not driven to any airport before MCO might not be the one to start with. You might be better off taking a cab to meet them somewhere close. Not only is the airport busy but the toll roads that the airport is located on and the adjacent roads are pretty hectic at most times as well. If you need some suggestions on where to meet them, let me know. Several of us are quite familiar with this area and can recommend a less traveled location close to the airport for you to meet. Having said that, my 20 year old daughter has picked us up there a few times and she was not familiar with the area at all. If they are comfortable with a GPS, it will help as long as they don't get panicked in unfamiliar driving situations.
I am going to Rainbow's End TODAY!!! Love it!! There are a couple of other really good fabric shops in the Orlando/Tampa area that you might not want to pass up if you have time. Let us know if you are interested in others.
Enjoy your trip and your parents.