The big thing is having a job. Most of my life I've been freelance or happily under-employed, but working a FTJ seems just fundamentally incompatible with creative work for me. After 8 hours of staring at the screen, I just don't have anything left in the tank for side projects, writing, music, all of the creative things that make me feel like I'm using my time on earth wisely.
Would be interested in any advice from anybody who has overcome this.