Might be worth looking into if you know anyone buying larger properties and looking for investors.

Lots of people move as soon as the kids are out of the house. 

As @Daniel Hyman said, getting into the 3+ property range can overwhelm people and take too much time.

I’m looking to find all sorts of people to work with, contractors, agents, private lenders, staging businesses.

Is BRRRR even possible for me, or is that for people with more cash down the road?

This is the best way to buy real estate right now.

Depends how you want to pay out. there are a lot of national syndication attorneys that can help and it's actually helpful but I think you should treat it like anything else. get 3 estimates and speak to 5 people, see who specializes in your strategy.

I was thinking about pulling 100-150k out of my house (currently owe 150k but worth 600k) to buy something to rent.

It’s not a market where you can just buy blindly, but for investors willing to do their homework, it offers a strong mix of cash flow and appreciation.If you’re open to learning more, I’m happy to share some resources on how I’ve built my portfolio there.

I'm sure in markets that differ from mine that people will have very different experiences.I'm in a VERY blue color cash-flowing market.