When doing BRRR, what do you say to a contractor to rehab a home?

[Mike Brown]

How do you figure out what specific parts of the home need to be rehabbed to efficiently get the most value increase out of the home? Does the contractor figure this out or do you need to tell them specifically what you want renovated?

Also, do you hire multiple contractors when doing BRRR for multiple properties at the same time, or just one? For example, assume I want 7 properties to be renovated within a year.

Thanks