I'm not a state licensed HVAC contractor yet, will be working on getting that next spring. I am though universally certified EPA section 608 and have my 410A.
As far as getting a contractors license, here in Ohio to even apply to take the test an application has to be submitted to the board showing you have been in the trade at least 5 years and have worked on at least one job a year that required a permit, you have to show permit numbers and who's license you were working under, it's very strict here now.
It used to be anyone could have a license, they gave them out like candy at a parade....almost lol. Then fly by night guys were doing shotty work, equipment was being given an unfair rep etc, so they really cracked down on who they give licenses out to.