So I'm trying to find another way to supplement or replace my job income.

Now in a retired persons case: if retired and a few rentals are owned to supplement retirement then some rent should be saved for major repairs, if no other saving exist. 

Real estate is one of the easiest ways to build passive income, but it is hard to completely supplement your income with investments.

The tax portion was likely "supplemental taxes".

For anyone who's read this book, if you'd recommend it, what additional supplemental books would you recommend that have also helped you without being too repetitive with this one?  

If you get the license just keep in mind to use it for supplemental income and education on real estate investing since a lot of agents don't spend the time to educate themselves on that aspect! 

My wife and i always had a goal to purchase a few properties that would produce residual income and supplement our retirement (I'm about 5 years away from retirement).

Our goal is early retirement in 15 years so we supplement that with buying pure rentals by living frugally and LOVING leverage :)This is an amazing site!

It's a long story; the job isn't ending cold turkey, just slowing way down such that I need supplemental income.

Like anything in business, it can be complicated, but you CAN learn and understand it.Another (not exclusive, but potentially supplemental) way you can limit the risk is to get an umbrella insurance policy on your properties that will protect you by paying out for covered liabilities in the event your property incurs them.