In every situation, it’s knowing when to bring in the big guns, if at all.
The closer, the negotiator, the advisor, the lawyers, the support, the expert.
Most situations don’t require the big guns, so the skill is in knowing when to bring them in and when not too. Just because you might be able too, it doesn’t mean that you always should bring them in.
Where possible, manage situations yourself or in-house. You’ll have more control over them that way. And then when you do have to bring in the big guns, it will have more impact.