-We were under contract/mutual on Thursday February 8th-Buyer couldn’t get financing when the lender checked employment.

My biggest concern is buyers wanting to view the property with the seller present.

Some notes to your bullet points:- Freddie: This sounds like you are talking about Home Possible (a Freddie program for first time home buyers and targeted areas).

I had a buyer back out at the last minute.

Should I get myself a buyer’s agent to help in getting me a better deal?

That way you can potentially get both buyers and sellers.Facebook Ads are and sales funnels are great for buyer leads since 90% of buyers are searching online.

Even if I took a couple of days to inspect, I could still close that deal by Friday and then close again later that day to sell to my investor.It's not the "closing" part that causes the problems; it's the "finding a cash buyer willing to pay my price before my contract expires" step that trips up most wholesalers.

I would add that if the number of investor units in the whole complex exceeds certain percentages it affects the ability of new buyers to purchase using Conventional or FHA loans depending on the %. 

Many FSBOs will pay commission to a buyer's agent, but that's negotiable.Your Realtor will also be able to give you fairly accurate comps for potential rental income.

The buyer looking at or making an offer in another property is irrelevant.