You have to ask yourself, why do you want to change? Unless you're freelancing/working for yourself, being a cog in someone else's machine will be just as much a soul drain as what you're doing now. Changing careers is a huge step for anyone, you won't be a manager anymore, you'll be entry level, entry level at 30 years of age. Competing with fresh grads.

If it's something you want to do, I'd get upto speed then take an extended vacation from your current job and try it out. Don't quit your current job and leave yourself a way back in.