A Roth IRA, as I'm sure you are educated on, will grow tax-free and you can withdrawal tax-free in your retirement. 

I am seeing a ton of investors spending money on education to get into bigger deals at an accelerated rate only to retreat back to buying the properties  that were of appropriate size and undertaking.

@Dan Kim - There is guy that does education/tutorials on developing business credit.

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

They can make sure your set up correctly with entities and taxes, plus since they're an education-based firm, you'll learn all the things you want to know about.

Somehow I didn't notice there was an educational part of the service. 

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!

You often hear from real estate investors who scaled businesses  attribute their success to great contractor relationships, a realtor who helped identify an underserved housing need, lenders who gave them a chance despite not having a balance sheet, even good attorneys who navigated them through entitlements or perhaps accountants who educated them on tax saving strategies.  

FWIW  my distributors provide net 90 billing, ongoing education & full OEM warranty.

Everyone's circumstances are different, so maybe it makes sense for you to borrow against the 401k, but I just think it is important that folks are fully educated on all factors before making that decision.