In the book Professional Selling by C. Shane Hunt, looking at the section "Today's Professional Perspective," "Executive Perspective," and "Career Tips." These sections are devoted to offering guidance on the jobs and professions of salespeople. After carefully reading each one answer this question. What are the three most difficult challenges a sales professional faces in everyday sales work? Are the recommendations to deal with them coherently, or can you find contradictions when comparing the different recommendations in detail? If so, what contradictions? Use quotes from the above sections to illustrate your answer.