With one successful flip under my belt, I'm eager to connect with fellow investors and expand my knowledge and network in this vibrant real estate market.In addition to my passion for real estate, I’m also a skilled electrician.

I actually think it is a benefit to both parties to have professional representation to assist the seller and buyer with these types of transactions.

Is there a pre existing loan with that bank with either of you?

NEVER borrow from a 401K, you are taking pre-taxed dollars and paying it back with after tax dollars, you do not get to return the loan with pre taxed dollars, in addition, some 401K plans do charge interest and maybe even fees, and lastly if you get laid off for some reason, it is a distribution with all the "fun consequences: tax at the last dollar rate, and if you are under 59.5 there is also the additional 10% penalty.Personally I like the HELOC, however you can also sell stocks and do tax harvesting there to offset gains if that is an option

The real skill is understanding the variability and risk in each number which is not always numerical or scientific.

From what you wrote it sounds like the rental you own is your sole, pre-marital property.

Would you mind sharing your professional opinion on which of these kitchen designs would sell better?

Start by getting pre-approved with a VA/FHA lender and targeting a multi-family property where rental income covers most of your mortgage.Good luck!

Look for some of those to go in as an LP (limited partner) and learn and grow your knowledge, skills and investment money so you'll be ready for the next accredited deal. 

There are variables involved, and there’s of course skill and effort required not just calls.