Probably like you, I'm pretty good at a few things and quite terrible at others. The idea behind MasterJacks was to share my experience as a Jack-of-all-trades, in hopes of becoming a Master of some.
The experience so far has been very educational. The viewing audience is made up of Joes, Jacks, and Masters. The questions and feedback I get on my videos cause me to think and often change the way I do things.
I hope the videos and community will help you gain confidence to stretch your own skills. If you're already an expert, share with the rest of us Joes the nuances of your craft. Learning and sharing are both part of being a MasterJack.