I would prefer to do this, then sell the property since all my properties are cash flowing well.Will I -just be able to resume normal payments after the 60 to 90 day period? 

What you would normally want to do is establish your own escrow account for Repairs/Maintenance, as well as Capital Expenditures for your rental.  

@James Bruntfield the blanket loans that most banks offer normally have a higher loan amount than what these properties would qualify for.  

Do most newbies normally hire out a GC to build their first house? 

If you have an iPhone, there is a way to make your own "Contact Card" in the Contacts app: I normally add my cell, email, and company there; list your "Company" as "Investor".

Normally don’t do a lot of shade or water activities but will find something else to do.  

That's pretty normal. 

For my investors, even with my GC markup, they still spend about 80% ARV from doing things normally so even they won't make much money if they sell it right away, but there's some equity in it for them and the cost is lower than buying.

My personal rule of thumb for profile age is that if the profile was created before 2015-2016 (when the internet started to get a bit crazy with misinformation ahead of a certain presidential election), I'll generally proceed as long as they're interacting like a normal person (not a bot) and their profile looks otherwise legit.

It is very normal for people to have second thoughts or get cold feet.