I'm giving my 2 cents here as a former Cooperate manufacturing Project manager gone Property Manager:I think the pay structure you have currently is an awesome start! 

If you sell now you won't be paying tax on that profit!

Ground was soggy and was wet in the basement under the open faucet!  

.- While self-managing either type of property is possible, if you hire out property management you'll pay a higher percentage for a skilled MTR manager than for someone to manage your Section 8 property.- While MTRs can be any size property, the bedroom/bathroom count is really important, especially with larger properties.

Sure it will cost more and take longer but consider it the price of your education.Other than that your option as others have point out is to find the money to finish it off the books of the hard money lender, sell it or refi it and pay off the lender and move on.

I was doing a lot of legwork and still paying RE agent for the transactions up until got my own license.pros: no commissions in your transactionseasier qualification as real estate professional to offset high W2 of spousecan get access to any house/ easy logisticsmore control in the transactionMLS access with all the information on tip of your fingers, you can move fast with the deallicense knowledge helps to make better decisions and gives broader understanding of the industrycan legally do property management for others, wholesale (many states now making outlaw to do it without license)cons:need to take an exam (it needs preparation and to be good not just barely pass you need to study)fees you pay along the way (MLS, brokerage(I signed with investor-focused on and have a monthly fee and a transaction rate))self-management including taxes and feesneed to relicense + paid education Don't forget the biggest con.

Both Prosper and Lending Club offer loans big enough to cover your 50% down payment.Something I would never recommend to most people, but as a last resort -- if you absolutely knew you COULD pay it off any time you wanted, you could put the down payment or at least a big chunk of it on a credit card and float it between 0% balance transfer offers until you get it paid off.

I would strongly recommend using a project manager or boots on the ground to manage your rehab especially if you're OOS.

While mortgage+ taxes may be similar to rent, you are not paying down the principal early on in the mortgage and closing costs on either end are likely to add up. 

I would then buy more properties and use that cash flow to pay off the 401k loan in time