Fall is a time when many anglers get excited about casting big, meaty flies to trout that are gorging before the long winter. Here’s a very useful video from Sean Visintainer of Washington’s Silver Bow Fly Shop, in which he explains basic streamer-fishing tactics for fall.
I especially like his point about leading the fly with the rod tip. I would add that, when you do get a strike, you should use a strip set or sweep set, rather than raising the rod tip immediately. This will keep you from pulling the fly out of the fish’s mouth.