With most new cameras I get, I just start shooting. It's not a gun, so there's no danger of harming anyone with that theory. I'm not going to want to have the manual or a video with me when I'm out at an event, so I figure the best way to learn how to figure it out is to figure it out on my own. Not to mention, most cameras of the same brand have similar controls, so it's fairly easy to figure out if you have used that brand before. Now if there's something I'm trying to do and really can't figure it out, then I'll go to the manual or search it online.
Canon Rebel T3i - 18-55mm Kit lens- Canon 75-300mm f/4-5.6 - Rokinon 8mm Fish Eye - Canon 40mm f/2.8 Pancake - Canon 70-200mm f/2.8L IS II USM