ensure the cut branch falls in a safe place, good and bad kinds of tree beds, consequences of more and less effective past prunings, the endless movements of cars and trucks - but it was also fun. As promised, passers-by stopped to enquire and admire, and some volunteered information about the travails of their own street trees.
One of my fellow students lives near me and has the gear. Once we pass our test, we're going out on our own!