I am in this position right now, having to transition from a relatively comfortable job to building a whole new business on my own in the same line of work.
The pressure is immense and it gets to me every few days and I'm paralyzed by exactly those things you described in the article, Kaylinart. I'm having to completely retrain my brain not to do what it normally does... worry about everything and instead read and react.
Having your goals and working step-wise to achieve them is easier said than done but it is necessary to always keep them in mind and reward yourself for what you did right... not punish yourself for what you did wrong.
Thanks for the post, it reminded me that while I have a ton of work to do today it is all in service of making stepwise progress to true professional independence.