Has anyone ever bought a non vacant rental property as their first investment?

[Joseph Fenner]

I’m looking to get started in real estate and acquire my first rental property. The problem I am facing is I don’t have income and no collateral so I can’t finance my down payment  with lenders/banks. 

So I came up with a solution to buy a non vacant rental property from an investor and use seller financing so I can negotiate a $0 down payment.

Has anyone ever done this? And if so what should I know?