If I, an untrained home owner can do it, a decent handyman can do the install also and then pay an AC guy for the final hookup. 

You don't want a second mortgage if anything goes wrong and in real estate, those who are untrained can experience a lot of issues.

Went to check it out the first time today for myself and I can see with my untrained eye it needs quite a bit of work but it is occupied currently. 

It looks good to my untrained eyes. 

The trick now is to untrain them.

Seems a lot of homeowners in this particular area (that had 4+ feet of water that took a week+ to fully recede) were unsure of whether the sheathing between the brick and the studs should be removed as many homes were mucked by untrained volunteers (like me haha - I helped muck a few in a different area in the weeks after the storm).

I don't get RE definitions from gurus or untrained investors or Wikipedia sites.

The LA provided both inspection reports, and to my very untrained eye doesn't look like anything major. 

An untrained taxpayer can easily start missing things.

To my (admittedly untrained) eyes, that sounds like much less risk than any other major RE investing move I could make.The alternative is to just not do anything until I can either afford a DSCR loan (probably 5+ years of growing my savings) or my income grows by ~100k/year (probably 8+ years).