If you hear "easy, fast, with no money required" - be cautious. 

I did it as a pass time hobby and occasionally going above and beyond for owners without charging them extra.

I'll try to respond to each component of your comment:- My idea of using an equity partnership as described above is coming from Brandon Turner's book "Investing in Real Estate With No (and Low) Money Down," and in the chapter on partnerships he goes through various why someone with cash may want to engage in a partnership.

Did you get all your money back by doing that?

You can get a bridge loan (nice way of saying hard money) for the renovations and then, once all is back to normal, you can get a DSCR or other type of permanent financing done, but I don't know of any permanent financing scenario for an investment property that would allow the property to be in that state. 

The worst case you would have to spend couple hundred or thousand extra over a regular move out rehab to clean up the extra stuff etc.

If you can qualify for it, get a HELOC or HELOAN on those properties.Or find a creative private/hard money lender that can tap into that equity in 2nd lien position or to cross-collateralize them with the purchase of the new property and use that equity towards your cash to close so you can buy that next deal without much cash out of pocket. 

If I go the hard money route for my first investment property, am I still able to use my FHA less than 6 months later for a primary rental or because I have a property already in my portfolio will it be unavailable?

As soon as we had the money saved and the opportunity presented itself, we jumped on the chance to start this journey!

This could help you clarify your goals and potentially save money for your future.