DH and I took the Lynx bus to the TTC on one of our budget anniversary trips. It is easy to do. Just be aware that the Sunday schedule doesn't have as many buses from MCO to the Orlando terminal as other days. If you are arriving on any other day of the week you should be fine. The stops at the MCO terminal are clearly marked, and you must have exact change and ask the driver for a transfer as you board. It took us about an hour and a half to get to TTC from MCO. Then you have to go to a park to get a bus to your resort. It takes a while, but it sure is inexpensive!!!
Lots of pixie dust--enjoy your break (I'm guessing)