Pay attention.STEP 1:Lists, foreclosures, absentee owners, probates bla bla bla, you need to send thousands of mailers calls or texts to get one deal yes?

Many lenders offer competitive introductory rates, so if the goal is to pay off ASAP you will benefit from this. 

transacting - buying and selling - is expensive and can consume years of gains, with all of the commissions and fees you have to pay. 

Now you need to figure out how to find deals and pay for them.

I pay an accountant well to make sure I have as little profit as possible :)For a small operation Google Sheets could work. 

The issue I run into, based on what I can put down, is that I would most likely have to split the mortgage down the middle (I pay half/Tenant pays half) based on current rental rates and current mortgage rates (considering what I can put down).

If that is the case, you sell the house, pay off the HELOC, and use the $15-$20,000 to get into a new house.  

DIY will be the "cheapest" - you can set up an account on the MA DOR website, register your LLC, you pay over the whopping $500 MA charges you to register an LLC, and voila, you are off to the races.

When I purchase my rentals, I have/use a large HELOC that i have on my primary residence to pay for the investment property in cash and also use the HELOC to renovate the property.

Insurance would cover it, I would pay the deductible, and no assets would be lost.If you are in an area like San Diego where people are more likely to sue, a judge is more likely to find you guilty, and the payout is expected to be higher, you may consider an umbrella insurance policy.