I currently have 2 pending offers on the first 2 properties but no inquiries as of yet on the third one, which lead me to my question: Should I go with a HELOC?

There's really no easier entrance into it than house hacking.

No need to RSVP.

No buyer's rep, no commitment. 

There is no state law that prohibits 2nd liens...if that's what you are asking. 

Once the property is rehabbed, you can refinance into a DSCR loan with no seasoning requirements.I'll let some of the traditional mortgage brokers chime in, but traditional financing might require a 12-month waiting period to pull your cash back out.

There are no specific plans developed at this point that anyone can offer advice on - I'm just overwhelmed and I feel like we're on a bit of a time crunch to get something going.

And arguably the best way to do it for young couple with no kids and no intention of kids.

Pittsburgh is very diverse and the markets are no exception; before investing in the many and varying markets make sure to properly analyze them.

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+, zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680, some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.