So I've been doing my own taxes in Turbotax for 20 years now (I only own 2 rental properties but both were BRRRs), and I finally got stuck on something and went to a CPA 2 years ago, and he reviewed my past 5 years of returns and pointed out that I had made multiple mistakes (incorrectly categorizing repairs vs capex, calculating basis and therefore depreciation wrong, failing to realize that certain expenses for a home converted to a rental property start being deductible the day the property was placed in service vs actually occupied, the list goes on). 

@Vy LeRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

Literally might be the worst advice on these forums right above.

never made any rookie mistakes, right?)? 

In the beginning the deals and terms are always going to be the worst.

@Taylor L. was very helpful and possibly saved you from making a mistake. 

The worst part is the foundation.

@John Leschber I've made mistakes too.

Best candidate, worst, somewhere in the middle.  

I made this mistake on my first rental I was renovating my first single-family and I left the blinds up on every window and you could see it was vacant and getting worked on and someone broke in and stole my copper plumbing.