They can purchase the parts online and install them themselves, or they can hire a professional and pay the bill.

You're better off hiring a great home inspector who can determine defects.

Definitely hire a real estate attorney to draft or review any seller financing agreement to protect your interests.Ask the real estate attorney how to handle the POA situation...can you talk with any of the other property owners who are short term renting out their properties to see what/if they have any issues? 

Unless you want to do the eviction yourself, hiring an eviction attorney can be expensive.

For an OOS investor managing with just their services, I imagine you'd need their full package which didn't seem significantly cheaper than hiring a local PM.

Vacasa and Evolve hire local people to look after clients they get in areas.

A lot of other novice rental owners, hire the cheapest PMC and then get ripped off with add-on charges or just poor service.What do you define as, "special situations only"?

I have never hired an inspector and have done 100s and 100s - appraisers  again    NO need, UNLESS your getting a loan then the bank will bring their own - contractors      Happy to help Thanks in advance, and happy hunting :) Hi have been buying and selling there for many years all while OOS.

Go hire lawyers to write your own contracts. 

There are some great turnkey companies out there, but I prefer to hire a general contractor for the rehab and do things myself to make more money.