My business partner and I bought 20 homes inside of a year and half and it was a huge mistake because we just wanted to keep buying and did not make sure that the homes fit our business model.

(Biggest mistake) I have made yet was investing in a flip with a partner.  

Mistakes happen and consistent, owner diligence is the only real solution and no doubt, some PM software ledgers are horrible to understand and PM should be able to clearly explain every, single question regarding your statement(s) and on the day of your inquiry.

I have made just about every mistake I could, which is always a great teacher. 

Make your mistakes on a smaller scale before you start borrowing other people's money and making mistakes on a bigger scale.

My listing agent's company is in direct contact with the asset manager on this property, and she at first said "maybe they made a mistake." 

Many people here have and end of financial freedom in 10 years or 5 years so what works for your end would not lead to their end.My biggest mistake was to not have better more lofty goals.

Is this worth it or should I find a mentor or just get started and learn from my mistakes?

You asked about my two favorite topics, Real Estate and Personal Finance.To answer your question, yes it is a mistake to not take advantage of her employer's 401(k) match.

I'm coming into my 4th year and to say that I could write a book about my triumphs and mistakes over these years is an understatement.