1. There are no measuring techniques to estimate the decline, but I personally use the distance of the lower and upper trend line at the start of the rising wedge. Then subtract that from the breakdown point. Normally gives one a ball park, to watch for next reversal. It's been my experience this is a 50/50 point which sometimes reverses and sometime stalls then continue down.
2. NO Because without prior trend into the first shoulder there is no heads & shoulders pattern.
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