I got a new job offer that really helps with my schedule since I'd be working from home and I'm still studying, but I'm feeling anxious about actually going through with quitting my current job.

I feel like I might not be good enough for the new job and they might fire me, and I feel like I'm in some sort of a comfort zone where I'm currently working. The thing is I also think the new job would be an improvement moving forward in my field.

How would you (or have you) guys manage(d) this kind of insecurities and anxiety?