I became more and more frustrated that the owner wouldn’t provide rent rolls or a P&L for the property and didn’t seem very eager to actually sell the property. 

I am so frustrated that the city isn't concerned at all about the septic system being outdated and don't want to find myself pushing the city so much that they push me to pay the $14,000 for the new line. 

That can be frustrating.

If you don't have the skills or patience to do it, hire someone who has experience with it as it can be frustrating.

There are weekly posts by new investors frustrated that they can’t get realtors to make “make 100 offers to get 1 property”.

That's where I'm at, sort of frustrated because I've come to a point in my "self-education" in REI that I realize that the BRRRR method (if you want to get all or even all+some back out) ONLY works with downright exceptional deals....I am not discouraged by this, if anything, I'm more fired up to sniff out the deals, but man...it seems like it's gotta be WAY below market value AND be situated in an area in which upgrades will drastically increase the ARV for me to be able to make the refi work for me and continue reinvesting that money in more properties. 

I know how frustrating it can be to have a bad property manager, it was the main reason I wanted to get into managing.

I am frustrated they didnt follow the contract.

Though I'm starting out in this world, I can see, and have seen through others in the industry, your frustration with commercial brokers.

First and foremost I feel you pain and frustration.