Two points, not a mood
On a head-and-shoulders top, the neckline joins the low between the left shoulder and the head to the low between the head and the right shoulder. On an inverse pattern it joins the two highs. That sentence is easy. The argument starts when the reaction is a cluster of bars rather than a single clean trough.
At the naming table we put the pencil on the extreme of the reaction only if that wick is isolated. If several bars share the zone, the line sits through the cluster, not through one dramatic spike that no later bar respected. Students hate this the first time. The dramatic spike is the part they came to draw.
Slope is allowed
A neckline does not have to be horizontal. Many of the daily charts we print in Ulsan slope. Forcing a level line because a textbook drew one is how a real pattern gets renamed into something else. We draw the line the two points demand, then we look at it. If the slope is so steep that the right-hand point is a different story, we say so and we stop calling it a head and shoulders.
The name waits for a close
In this studio the pattern can be sketched while it is forming. We do not treat it as complete until a daily close has gone through the neckline. A wick through the line is a note in the margin, not the event. Evening one of the Recognition Circle is mostly this distinction, repeated on three charts, one of which is only three bumps in a range.
If you want to try it tonight, print a daily chart, mark the two reaction points with dots before you draw anything, and only then lay down the line. If you cannot explain the dots to another person, the line is early.