What is the proper way to change a drill bit? I see many online videos, where they remove the battery, open the chuck hole manully with hand, and then retwist to tighten manually. In other articles, they use the battery to automatically open, and then auto retighten with the trigger. For my particular drill, it does not mention in the directions, and trying to figure out.
Entirely up to you. Manufacturers need to write instructions which put them totally in the clear so even fully paid up idiots cannot sue them.
I've changed bits on drills for several decades using the rotation from the motor, with no problems. But it would only need a bit of swarf on the chuck to make me think again. Wearing gloves would probably remove that threat. As with all power tools, exercise caution, and weigh up advantages/disadvantages of how to perform certain operations, but I wouldn't be at all surprised if most tradesmen didn't do it my way!