I find the success of a 123 to be confirmation of previous price behavior that signaled a possible trend change.The previous price behavior i look for is three pushes(or legs or drives).These pushes occur in a trend channel contained by a tl and a tcl(or ltl and rtl or whatever you want to call them).Thales calls this pattern a diagonal.I know them as wedges.Doesn't matter what you call them it's seeing them in real time that matters especially if at an important horizontal S/R price area.Once the third push touches or slightly overshoots the tcl and price reverses then i consider this a possible start of a trend change.For further confirmation of the trend change i need to see a strong counter trend response that pushes price out of the channel and clearly past the tl.Now i look for further confirmation of this possible trend change by how price reacts on the retest of the third push's extreme.I need a test that fails to exceed the extreme to again confirm a possible trend change.Next i need price to reverse and push back to the previous ct swing point.Finally all i need is for price to push past this swing point (trade entry one tick beyond swing point) and continue pushing in this direction for total confirmation that the trend has changed.Sometimes on the retest price pushes thru the extreme and the trend continues causing me to again look for three new pushes,a strong ct tl break out of the new channel,a failed retest of the new extreme and reversal push past the new swing point(triggering entry).Other times price slightly exceeds the extreme and reverses again setting up the need for more confirmation via another 123 for total confirmation of trend change.Hope that helps