How To Build Your Own ADU?

[David W.]

Hello!
I have room in the back of my house to build an ADU (not garage but separate unit). I have gotten the mainstream quotes, which are INSANE i.e. $150k. I want to just do it myself as I have been told if I do it all myself aside from electricity, plumbing I can squeeze by on $50k.

I expect to go through a life changing experience (good and bad I'm sure) but if I can save nearly $100k from the retail price I'm all in! 

Has anyone ever done this themselves - rolled up their sleeves and actually built it? Looking for starting advice and cost estimates etc. Anything would help!