Since I started training in Krav Maga two years ago, I'm in the best shape of my life.

If you find it to difficult at that point, then investigate getting additional training

You can also offer to be there on site while they are out to make them feel more comfortable.

I am a former insurance agent and was presented with multiple certificates of insurance that when I went to verify them they were actually not valid and/or the insurance was not the proper type for the work being done or may not have extended coverage to any workers or employees or contractors they were planning to bring on site to wortk.

I'm wanting to build my residual/passive income streams, so I know an onsite manager would be needed once up & running. 

Quote from @Cory Waldron: You don't need a mentor, a coach, an investment training program, an LLC, or any of that nonsense people try to sell on YouTube videos.

Lastly, invest in advanced courses and resources that go beyond surface-level information, seeking specialized training in foreclosure investing that covers in-depth strategies and risk management.

These are professionals with additional training and a stricter code of ethics.

This is to train your tenants that late payments are not acceptable practice.

You really can't trust any of them to complete the work correctly, unfortunately, as the owners of the sub companies are rarely on site and you have to babysit their guys to make sure things are done correctly.