Yes I ONLY resorted to his video series as I just got hired in as a Uinifed Communications 'Engineer' (My company loves the title Engineer), and I told the manager up front I had absolutely no phone or really network experience beyond a CCNA, but he had a good feeling on me.

So I couldn't let the opportunity slip, fortunately his voice series matched up well with SMB customers at my MSP, some of them still using those old UC500 routers solely as there phone system up to multiple Call Manager / Unity / Presence servers.

That was my lucky break into networking, the hiring manager left the company a couple weeks after hiring me, I like to call myself his last **** you to the company but fortunately it worked out very well