Have spent about 5 years in Program/Project Management, and 10 in Developer Lead roles, and the big thing I'd have to say about the PM world is that just because it has Management in the title doesn't mean you're a people manager.
You're the developers' peer, and will have to do a good chunk of work convincing them that the work you think is important, is in fact important. Everyone has gut feelings on what the project should be and where it's going. Your job is to provide hard evidence and tracking of that on behalf of the end user.
Also you're not a full time dev anymore. Don't take dev tasks on unless they're menial and no one else wants to do them. Nothing undercuts trust like doing someone's job for them.
You're the developers' peer, and will have to do a good chunk of work convincing them that the work you think is important, is in fact important. Everyone has gut feelings on what the project should be and where it's going. Your job is to provide hard evidence and tracking of that on behalf of the end user.
Also you're not a full time dev anymore. Don't take dev tasks on unless they're menial and no one else wants to do them. Nothing undercuts trust like doing someone's job for them.