The biggest issue is to have the right management in place. 

Yeah i will do that and thats my biggest fear diving in and losing it all due to money issues 

Rents are generally the biggest and easiest as it is always easier to bring in an additional dollar of revenue than it is to reduce a dollar of expenses - both impact net operating income which equates to an increase in value.

Just do an internet search for Certified 203k Contractors or Certified 203k Contractor Directory and you'll find it. 

Whenever I ask investors what their biggest mistake is it’s almost always that they invested in an area they didn’t know.

Right now, our biggest setback is finding good deals fast enough.

I see a lot of them struggling with a few different things, depending on what size they are looking at:If you are looking at 2-4 unit properties, one of the biggest issues is getting a good handle on the finances.

Biggest struggle I am faced with right now is actually getting funding as I do not have a visa / green card to live and work in the US yet. 

The biggest failures for flippers come in shortcuts.

@DuBeaux Dingle  The biggest things are the extra costs with condos or townhouses due to condo/HOA fees and how they are run/maintained.