From Overwhelming to Routine

I've been thinking a lot about jobs recently, and how I plan at some point to leave the retail industry to try something different. I was thinking that if I get another job, say, in an office, it's going to be a completely unknown environment and in my first few days, I would probably find the tasks overwhelming. I say this because this is exactly how I felt when I started my first shop job. Now I can't believe I was ever scared by the prospect of operating a till; I can do it in my sleep. So I know that if I got a new job the things I find overwhelming would soon become routine tasks. This is all pretty obvious but it's still interesting to think back to your first day at work, and compare it to the present.