A common mistake for new managers is to do their reps' jobs for them, especially in tough deals. This approach, born from insecurity or a desire to prove worth, prevents the team from developing self-sufficiency and ultimately fails to scale. The manager's true job is to build skills and muscle in their reps.

A leader's role in a sales call is to empower the rep, not to perform. When a manager takes over a meeting, they disempower their rep and effectively take ownership of the account. MongoDB's CRO Cedric Pech calls this 'promoting yourself into being the rep,' a mistake that stunts rep development and creates customer confusion.

Promoting top individual contributors into management often backfires. Their competitive nature, which drove individual success, makes it hard to share tips, empathize with struggling team members, or handle interpersonal issues, turning a perceived win-win into a lose-lose situation.

A sales leader's job isn't to ask their team how to sell more; it's to find the answers themselves by joining sales calls. Leaders must directly hear customer objections and see reps' mistakes to understand what's really happening. The burden of finding the solution is on the leader.

First-time managers, often former top performers, default to doing the work for their reps. This creates dependency and prevents the team from developing self-sufficiency, which is crucial for scaling. A manager's true role is to build the team's skills, even if it's slower in the short term.

Ineffective leaders use Quarterly Business Reviews to demonstrate their power by grilling reps. Great leaders use a single deal review as a live coaching session for the entire sales floor, knowing one person's mistake is likely a problem for hundreds of others.

Many sales organizations mistake "coaching the deal" for actual coaching. This is merely reactive performance management. True coaching focuses on developing a rep’s core capabilities—like discovery or closing—which prepares them for any future deal, not just the current one.

When a sales leader dominates a customer meeting instead of supporting their rep, they effectively demote themselves to the rep role. This behavior disempowers the actual account owner, confuses the customer, and destroys a crucial coaching and development opportunity for the salesperson.

A manager who constantly jumps in to save deals is a "hero manager." This behavior, while seemingly helpful and often driven by a desire to help, undermines long-term growth by weakening team standards and stunting individual rep development.