All this being said, insurance contracts are complicated and I’m by no means an attorney, just giving my .02.  

If moving suddenly complicates things, that is a risk you have to think over. 

If you have cash its not hard to analyze a property and get the loan. when you don't have cash then that is where you have to do complicated things to pay for a property that will be profitable

All of this is nuanced & complicated which is why I don't believe any single calculator exists. 

Much less complicated / expensive than building from the ground up. 

It's not impossible to do a 1031 exchange out of a property while carrying back a note, but it's complicated enough -- if you're going to make the deal attractive to him, find out if he plans on looking at a 1031 and come prepared with information to help him navigate the hurdles that come with the seller financing. 

Foreclosure is expensive and time-consuming, so most lenders won't even begin the process of foreclosure until payments are 4-6 months behind.In a non-judicial foreclosure state like Georgia, the four weeks of public notices are all the advanced notice you're gonna get as an investor!

Nevertheless, it will be a bit complicated. 

You can do it yourself; the process isn't terribly complicated and doesn't require much technical skill, but it is a lot of physical labor, and you'll probably want to get friends to help.

If I didnt have time to learn it, clearly I wouldnt have time to make something so complicated be successful.