There was a lot of work we needed to do which seemed insurmountable for the 3 days we were there, and the fact we didn’t know how to or even what would be up to code (ex.

But it came at the cost of a ruined (cannot emphasize that enough) credit score and insurmountable credit card debt.   

Frankly, I see GCs logic, but also some of that 32 doors minimum waffle is to paint an insurmountable picture and encourage you to think about investing with him instead. 

And there's a sump pump installed right about where I'd want to put it, so that may be an insurmountable challenge. 

Not insurmountable by any means, but you just want to be prepared and realistic.

As far as major issues- honestly nothing was insurmountable - the biggest issues that I've come across has mostly been deferred maintenance from previous owners and having to put more money than I originally planned in at the start, but honestly I'm seeing that money in area appreciation and with the excellent cash flow (For example I paid about 65k for my duplex and now I'm getting 1200 a month for it)We had some wood rot which was a little expensive to fix, but it was fine.

The tenant has almost an insurmountable amount of work to provide for that family:  provide an income, cook, clean, shop, get the kids to school, etc...   

Nothing is insurmountable!

SO many things go wrong, and by wrong I'm not talking insurmountable, but those things that cause delays. 

I've run some numbers on some Trenton (and New Brunswick and Newark) properties, and while it's not insurmountable by any means, it certainly makes it more difficult!