I recently re-read The Challenger Sale.
Granted, I don't work in sales but everybody sells - whether it's a product, a service or your personal brand.
I also believe that sales skills are essential for any consultant because they teach you to think differently when you're trying to provide solutions, are doing presentations and pitches or are simply talking to a customer about a difficult situation.
Especially when it comes to solutions, you need to help your customer get to the solution on their own by probing them with questions and guiding them rather than point-blank dropping the solution onto them because that's not how they'll truly adopt it - they need to come up with it on their own so that it sticks and so that they firmly believe in it.
Back to the book - it lays out the ideas and strategies behind some of the most successful sales teams and sales reps and how they perform the job in today's world of sophisticated buyers.
Most of the selling approaches used nowadays are no longer effective because buyers are fed up with being interrogated without receiving any value.
There's a better approach to successful selling that the book promotes - the Challenger model.