One of the most useful pieces of advice I've seen here for comeback players is to get a teacher. I've been taking lessons for six weeks now, and I'm not sure my teacher knows what to do with me. (I didn't think to ask whether he'd ever taught an adult before - there may be a politeness factor.) He never suggested a particular method book and does not assign lessons in the ones I ended up with (Rubank's Elementary and Sandoval Part One), so I just proceed as seems best and go in for checkups. If I suggest things (ideas stolen from here or books) he's usually agreeable - for example, alternating playing phrases, as mentioned by rowuk recently.
I'll probably ask at some point whether he has any specific recommendations (so far it's 1-take the horn out of the case, and 2-blow it). If he asks what I'd like to do, it would be good to be ready with some suggestions - anybody willing to share? For example, is it generally better to go through the 4 Rubank books before starting Arban etc.? What about memorizing tunes? (I have the memory of a pet rock, but maybe it's good for you?) Listening and imitating last week - during the snowstorm - resulted in the best lesson I've ever had, BTW. I'm going to push to make this a standard part of all lessons from now on. Or maybe just asking him to play for 30 minutes and listening carefully would be even better?