Do some split testing.

In other words, any help pressure testing this would be much appreciated.

Your license is generally a 75 hour course (can be done on-line) and a $50 test.

Going from 3-5 to 20-25 at any given time is very challenging both in-house crew wise, extra more challenge if you hire out to subcontractor (I never believed you can have success if you're using them), even with an in-house crew, growing 3-5x a year should be a good pace to scale, this way you can test your abilities and how strong your group is.

I'm actually studying for my test.

Was the test hard?

You could run a test ad on Craigslist and get a feel for the rental demand in that neighborhood.

@Chris Seveney  sounds like a Howery test case...

I just passed my WA State test last week after using Rockwell.  

If there is an electrical issue, you can test it with a multimeter, or remedy a cleaning issue that is blocking gas flow.