House hacking first duplex and then the second one - steps?

[Tom Hastert]

For those who have serial house hacked: Please tell me about your first one and how you did it, but also how you did the second one.

I am planning my first move in duplex house hack, but I always wondered about how you accomplish the second one a year later. Kind of like playing pool where you are always thinking of your second shot when you take your first shot.

What are the steps for going from your first duplex to the second duplex (or triplex/fourplex even) a year later?