Start creating systems for things you do every day, like a checklist for your morning routine, because you’ll have to systemize your business to scale.

If you're going the umbrella insurance route, make sure it will cover you for several things including just the routine slip and fall (like mold or earthquake).

What are some things that beginners are routinely failing at? 

I was uncomfortable putting down EMD as this would be the first deal I did on my own (as part of a syndication) and I didn't feel confident enough. 

Uncomfortable switching lanes for me. 

Preventative maintenance is smart, but in my experience as an investor and property manager, the AC filters are really the only routine maintenance item you need "eyes on" for more than annually. 

I routinely find distressed, on-market properties on my local MLS here in Springfield Missouri. You can find great deals just by making enough low offers.

I will make sure the seller knows I am uncomfortable with doing this and will do my best to change his mind and have us proceed with the deal as planned.

Growth comes from those uncomfortable situations. 

I suspect the title agent has identified a problem either in the chain of title or the foreclosure itself that makes the Seller uncomfortable in giving any warranties.