Trial and error your way thru it and find your niche and what you are good at.

Their experience will probably be better than my trial and error with whatever solution(s) I can implement myself.

It's like the diet and exercise plan for losing weight....it takes time and consistent effort. 

I feel like finding a good PM is like a trial and error.

I tried the free trial of Foreclosure.com and to me the data available seems very dated.

I just supervised the work, sourced all the material and labor, and paid an agent to list and sell the homes.With the foreclosures commencing again, I am thinking of getting back into this as my "trial" the first time actually went pretty well.

Very (very) tersely;  a full renter screening, has a bank account with your down payment needed plus some, $5k to 10k, great jobs, I only take dual income families (my trial and error), AND must have the potential of cleaning up credit to get a bank loan.The main issue investors wiling to seller finance don't think deeply about is;  if a buyer is too weak to get a bank loan, and bank lending standards today are as low as they ever were (well almost) why should you take the change?   

Its a matter of trial and error. 

Also, why has there been NOTHING on diet and exercise to improve cardiovascular health?

It costs money, but they offer a free trial to see if you like it.