You can hire expertise out.  

Investing in real estate requires careful planning and due diligence, but with the right approach, it can be highly rewarding venture.

Welcome to Bigger Pockets, the forums are great for getting your questions answered from experienced investors (& if you're an experienced investor yourself, your expertise is much appreciated). 

I'm an investor and my expertise is in investing and finance, not construction, maintenance and repairs.  

Now he has to make choices and put forth the effort to live his most rewarding life.  

<3I have a bunch of random thoughts, questions, & scatterbrained ideas regarding building an ADU that I'd love some guidance/feedback on if anyone is willing or has knowledge/expertise on! 

[If that makes sense :)]@Trevor Lohman - Going this route does have a good amount of rewards but also in my opinion has a lot more risks and expenses.

Building relationships and rapport during property tours can also result in unforeseen rewards, such as sellers leaving equity in the transaction because of the trust and connection formed.Remember, every property tour is an opportunity to collect information that is not available on paper.

Squatters squat because the potential reward exceeds the potential punishment.  

If you have those attributes and know how to screen well, its a very rewarding and lucrative business model.