I tend to chastise myself and fight to move past it.
My opinion and understanding of insecurity has always been that you either push past it or become a slave to it. The slave role doesn't suit me so..........
I look back at all the things/situations where I have felt insecure in the past and how I pushed through them. It only serves as a reminder that whatever this current one is - it's only one more like the others. So I just dig in and let past successes power me through this one too.
I suspect, after a while, if you can master this, it just flows naturally with hardly any hesitation.