Led Upgrade

Looking for some more advice from somebody who's been there please. I am thinking about upgrading my lights, or just the bulbs actually. I am riding a 2006 Scrambler. Since I don't do much night riding anymore, I am thinking just the turn signals and brake and tail lights. I have been looking around and there seem to be plenty of available options for sale. Are these changes plug and play? Will I need to change the flasher as well. The headlight seems to pose the biggest problem, but I don't plan to change it now. Thanks guys.