I haven't really had the opportunity thankfully where the amount owed after leaving was worth my time but have no issues stating I am a man of principal and sometimes petty and would go for it, especially if I thought they wronged me just to make life more difficult. 

Relationships with wholesalers -- and other RE professionals though the wholesalers are the most difficult breed.Yes they send out deals at ridiculous prices.

If you’re planning to BRRRR, you’ll also find it difficult to get solid deals, and you may need to be okay with a less-than-perfect BRRRR with some money left in the deal.

If the renter/buyer defaults, it may be difficult to get him evicted since he may have an equitable interest claim.

I'm looking to get into real estate investing, but it's all quite overwhelming and it's difficult to know where to start!

But in fact, it sometimes makes the situation even more difficult.

I think it'd be difficult to find a market right now where there aren't people begging for a unit to live in because of such high demand.

Those are getting difficult to find in the Twin Falls area. 

I was in the New York/New Jersey markets and finding it difficult to find deals we wanted in our backyard. 

We are trying to find some general contractors to bid out some extensive renovations, however it's extremely difficult to find vendors willing to drive out to the coast for work.