I just did my first ever MR this past weekend. LAX-DFW-BOS and back by the same routing. The one thing I learned is that when choosing a hotel, really check out its location before booking. I booked the Sheraton Newton, which seemed close enough to Logan airport, but the taxi fare, including tolls and tip, came to $40. I know, I know...I didn't do my homework.
Took Back Bay Shuttle from Newton to Logan next morning for $12.00.
The other important thing I learned, since I'm doing another run in a few weeks on the exact same routing is get to Boston 2-2-1/2 hours early due to the extreme congestion at security. I thought it might have been holiday travellers, but someone in line with me said it's almost that bad all the time.