It's extremely important to look at price action where you are looking to place your trendline.
What I like to first start off is with looking at the areas where we have seen either gap up or gap downs. Starting at the most significant relative area to my analysis, I will continue that line, scoping out other gap areas if within reason. Some are very obvious....
In the screencast I show two possible head and shoulder patterns - with a degree of uncertainty.
The bigger issues are signs of a trend change and momentum developing for the south. So, it doesn't matter at this stage where the base of the head and shoulders is. It is a no-loss position I'm in at the moment.