Technical skill gets you hired once. Professional execution on the day gets you referred and rebooked.
Managing time: a realistic shot list and timeline, accounting for setup, transitions, and buffer, prevents the rushed feeling that produces weaker images and a worse client experience. Buffer time deserves deliberate planning — almost every shoot hits at least one unplanned delay.
Directing people who aren't used to cameras: clear, confident, specific instructions ("turn your shoulders slightly toward me") put clients at ease far more than vague prompts ("just be natural") — a learnable communication skill, separate from photography technique.
Backup plans: a contingency for equipment failure, a weather backup for outdoor shoots, and clear communication if the plan needs adjusting. Clients generally forgive problems handled calmly and transparently far more than problems hidden or handled with visible panic.
How you handle an unexpected problem often matters more to a client's overall impression than whether the problem happened at all.