Two of them had really light income, one of whom also had a vehicle repossession on his credit.

Presently we have lots of sensors (moisture, motion, light, sound, etc) that can be used to provide input to control the HVAC system, lights, appliances, alert us when there is water in catch pan under the laundry or water heater, etc.  

However, be warned.

Light fixtures.

This combination works great 1 coat primer and 2 light coats of the ultra paint.

Just fair warning, dude)Don't try to take down a deal you can't control and/or don't understand.  

Any hiccups, lessons learned or warnings worth sharing with others?

I am in the state of Maryland and a woman who stated to me she owned both the land and the stucture, caused a light to go off in my head.

(I just purchased the book Investing in Real Estate with Low or No Money Down.)I would love to for anyone to shed some light on the process and what steps I should take and things to consider before I begin. 

Get the key from the owner, follow your municipalities rules for advanced warning to tenants, usually 24 to 48 hrs, then go in but politely and simple inform them of these ' rules' and ' rights' & permission from current owner.