1.  Using the transport system - busses and airports.
2.  It was a different adjustment because transportation back home is by car whenever desired.  By bus and by plane in a different country was nerve-racking.
3.  It has become more and more routine.  If I want to book a flight, I don't think twice about taking the cheaper option out of Madrid because I know I can feel confident about getting there by bus without worry.
4.  I had to feel comfortable about my Spanish at the ticket window.  Use fewer words, speak up.  I always get a schedule from the information booth and practice what I will say.
5.  The transportation system has allowed me to value a weekend trip.  I sit on the bus and see mothers with children, business people.  I've realized that bus travel is more practical here, whereas in the United States it is viewed as a last choice.  I feel comfortable on the bus, feel like I can take in the countryside.
6.  I still don't think I will freely use bus transportation back at home.  However, I feel more confident with getting around in a foreign country, more confident with feeling comfortable as a foreigner using a transportation system.