You can't do everything yourself.
That's why you brought in the experts. Now give work to them.
Empower them to make decisions, and back them up when they need.
Tell them clearly what you need done, how you will measure success (or failure), what the timeline is, etc.
Allow them to do something out of box, if you think it will help the business.
Don't be severe when mistakes happen, but make sure lessons are learned (and never repeated).
Give them what your experts need, and don't interfere needlessly. Just look at the reports (and verify yourself.).