At worst, fair chance of some quality mentors. 

It can eat into your cash flow, but if you're earning high income from your W-2 job (I assume you are if you're buying in all cash), it makes more sense to use your time making more income versus managing maintenance requests as you scale. 

Section 8 is best used as a risk mitigation tool for properties in super low income, high crime areas.

Quality VariesNot all coaching programs are created equal.

Buy a quality property, stay away from the hood, rehab it as if you would move in, take your time picking a tenant, you'll be find.

Don't invest in a market if you can't find a quality PM!

The BRRRR strategy was great a couple of years ago, but it's much harder to do now because of the high interest rates.

Real estate syndication investing is still quite valuable as it can offer higher Returns than investing in public REITs but not as high returns as direct ownership and management of real estate by some experienced people, but with the benefit of being far more passive, than direct ownership/management. 

Goes back to that original thesis in a thread long time ago-- quality over quantity.

The quality of your tenant is just as important as the investment you make.