I don't see any harm in that, you'd then simply high sub contractors.

No harm unless they freeze your line.It's about finding what content means to you. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

Is there some way being licensed could harm my goal of investing?

is it in the groundwater or notMost people think leaky storage tanks from gas stations and such are really expensive to clean up, but in reality this type of substance can be relatively cheap (none of its cheap).

If they don't like it for any reason within the 7 days, then they can get out of the deal no harm no foul, and their money will be refunded to them.

No harm in asking, but I would not be surprised if they held onto it since they would then probably have to find a new place for their daughter.  

I don't wish harm or foul upon anyone, and it pains me to see the financial mistakes that so many people make in their lives.

Where I am at, it is a 24 hour notice to enter unless emergencies, but depending on the issue I wouldn't do that notice unless it will damage the building and harm the tenant. 

Drew Lamb I don't see any harm in having initial conversations with some folks.