In this How to Paddle Series, Mike Aronoff demonstrates the proper technique for the high brace. The high brace is a great way to keep from capsizing your kayak. This video series is sponsored by Jackson Kayaks.
No, that isn't going to stop you capsizing, You need to practice going over far enough to get your ear wet before you can rely on your skill level with this stroke being sufficient to save you in a real situation. That tentative novice learning level is nowhere near sufficient.