In every enterprise consider where you would come out.

Starting something is easy compared with finishing it, and the finish is the part that gets least thought. Where does this end, what will it have cost, what are you committed to afterwards: those questions are unwelcome at the beginning, when enthusiasm is highest and the answers would be inconvenient. Working them out early is the cheapest thinking available.

Before your next commitment, write down what completion actually looks like and what you will be left holding. Ask how you would get out if it went badly. If neither answer is tolerable, now is the time to know.