Make it easy.This is not exhaustive, but was curious for those who have gone down this path what else you may have learned so we can continue the education process for others.  

Once you have an FHA loan you are not allowed to have another FHA loan unless relocating a great distance for work.Now that you have exhausted your Low Down Payment Options (Portfolio Conventional and FHA Conventional and FHA) you will need to use a Standard Conventional Loan and put 20% down to get your 3rd Duplex.The sky is the limit...you could continue to buy properties and build an empire or just stop there and enjoy more free time...I have friend who quit his job and just manages his properties now.Keep in mind that this 4 step process I outlined takes time (anywhere from 1 to 10yrs depending on the person) so keep the big picture in mind but don't let it stress you out too much.

Here is a bit more exhaustive article from Barron's which sheds a little more light on this so-called expert! 

They smaller houses have two chimneys, connect the exhaust there. 

That said, we don't need to imagine that any of the requirements are infact insurmountable or exhaustive.  

It's been some time since I've been actively posting, so I thought I'd drop-in and update y'all on my experiences over the last two years.First, man I'm exhausted.

Some would say we hit inertia because we are bogged down with these details, but we have a lot of reasons why we are currently working in our business instead of on our business.All that said, I won't pretend that it isn't exhausting and at times very frustrating to self manage.  

That said, it's exhausting and seems never ending.

Unless your plan is exhaustive enough that you have every single line item covered and you can create accountability for each contractor who steps foot onto the project, you're bound to face bottlenecks with this approach.

This is not an exhaustive list, but hopefully a good start.