If you're just trying to do a traditional buy&hold or fix&flip, you absolutely do not need a mentor to do that.

I’ve personally seen a multi-family commercial flip through my co-investing club, and it highlighted how larger commercial deals can be structured collaboratively while mitigating some of the hands-on management that comes with residential rehabs.

Also, say you hold them a decade or more; the right location can send your return through the roof making you very wealthy.  

A hand full of single family homes don't allow you to build systems.

Do you usually underwrite flips at 6 months hold?  

Is there a way to know before hand if drywall would need replaced?

Origination costs usually can't be rolled into the loan on PM/HM funded deals so you'd be on the hook for closing costs and as Nicola mentioned holding period costs. 

After those years, appreciation not equity accrual is the most critical factor to walking with $ in hand from a sale. 

They are often clueless to holding costs.  

I have a great paying day job, and i have enough cash on hand for 6+ months reserves.