That's part of it. But double tops, and double bottoms, occur all over the place, as do lower highs and higher lows. To trade them simply because they happen to occur doesn't make them good trades, particularly if one has to exit a perfectly good trade in order to take them. Though some disparage the consideration of context, without it one ends up getting out of trades in which he ought to have stayed, and avoiding entering trades that he should have taken. This is why Wyckoff urges the trader to determine the trend of the market and his place in it before planning his trading session.
I'm not trying to be coy here, but little is served by my providing all the answers. I've already done that. In five+ journals. So just chew on it. What is price (traders) doing before the double top?