Job hunting is hard!

I have over 10 years experience in software engineering. I do mostly full stack, so I can say I'm a jack of all trades and a language agnostic. I'd say I'm a good software engineer and will be able to tackle any task I've been assigned to. Having said that, my confidence in finding a new role is at an all time low.

I've been job hunting for 3-4 months now and so far I've only had 1 interview and it was unsuccessful. Now have been invited to a first round interview for another company (first of many rounds). It's going to involve many technical challenges like coding, algorithms and data structure and system designs.

In general I've had hardly any interviews (about 6-7 in total in my whole career). Due to my lack of interview experience, I've been getting anxiety especially now that the job market is tougher than it has ever been.

Firstly, how do you guys prepare, if at all? I feel like many of these interviews require you to be good at interviews, almost like an exam. If these questions were presented to me when I first came out of college, I would've had a better chance.

Secondly, how do you take rejections? I didn't know how painful it was to get rejected, regardless of how much I wanted the role.

I've been fortunate enough to still have my current job, but because of that I don't really have much time, nor the mental energy to study for interviews.

Apologies I'm advanced for poor grammar, I'm writing this on the train.

When learning new tech, it takes me forever to get the environment/dependencies setup because of the million different errors I get.

Am I just too dumb to follow installation instructions?

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When I doubt..

Joined a company as a junior developer and have been working there for almost 4 years.

Too scared to leave because I don't know if I'm good enough to apply for a non junior role :(

Is this the so called "imposter syndrome?"