" I would try to avoid "how", and use gerunds rather than a combination of gerunds and infinitive. The prepositions you used are the ones I would use. "My primary duties consisted of coaching clients on (the subject of) identifying areas of weakness and mentoring clients in building self-confidence.
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AnonymousI'm generally confused whether words like instructing, mentoring, coaching, and even tutoring take the preposition "in" or "on."I would try to avoid "how", and use gerunds rather than a combination of gerunds and infinitive. The prepositions you used are the ones I would use.