This strategy does not work 100% of the time, but it does offer a good risk reward ratio.
If the pattern occurs in the first 15 min, wait for about an hour and observe the price action, and take a trade only after the breakout. Taking a trade too early may result in your SL getting triggered too soon. You want to try and make it harder for the market to trigger your stop loss, hence you should set it just above important levels and not exactly on them.