When you get an expert in, make sure they’re the real deal, and not a fake.
It’s easier than ever to get fake or near worthless competency certificates but in the same era, it’s now easier than ever to check if they’re genuine or fraudulent. Have you done all reasonable checking to ensure your expert you’ve hired is as competent and qualified as they say they are?
Also verification of competency should be done to cross check they’re able to deliver on the elements required, even if they’re qualified and experienced. A tip is to do some quick desktop exercises to prove they’re able to deliver on the expectations or take them into your workplace and see how they’re behaving in the natural environment. Do they look at home or like a fish out of water?
A few minutes doing this will save you hours or days of fixing the issues a biscuit creates…