I don't see how they relate to wanting to educate myself or asking for reading recommendations. 

This group is full of knowledgeable people, though you may sometimes get conflicting advice.

This is not one of them from my recollection.I know this does not assist but what I would say is continue to do research on them.

There is a very big difference in my point of view hearing from someone who knows someone first hand vs. someone who just goes and does some internet research. 

I don't think enough people consider this aspect.Selling Stock: Selling part of your portfolio could work, but the 15% capital gains tax might make this an expensive choice unless the stock has underperformed or you’re diversifying away from riskier investments.HELOC: Using a HELOC on an existing property is a flexible and relatively low-cost option.

By any chance are there any agents on this site from there?

In 2014 it cost me about $42k to do this.  

Is this a good or bad idea?

Try this link: Publication 5653 (6-2022)

This will get you 90% of the way there and should be sufficient.It works the same in a saturated area, it's just more to sort through.You are aware that STRs in Denver are allowed only in certain zones and you must live onsite?