One of the things I’ve noticed about starting a new job is how all disorienting all the little things can be; especially if you’ve been at your previous employ for a long time. You expect all the big things to be different; you’re doing something different with different people in a different place, you’d be a fool not to expect difference. But the little things throw you.
Like the way you lose all your informal status. If you’ve been somewhere for a few years people know you, they know your status, they know what you’re allowed to do and say, they know if they have to listen to you or not. Not in the formal org-charty way, but in the little casual complexities of company life. Yes, you may be in such and such a position, but are you going to be around for a while? Do you matter? Do people listen to you? When you’re new, they don’t know this and they don’t know how to deal with you.
And you don’t know how to operate in you new place, you don’t understand your own informal authority. Again, not the formal systems, but the informal things that you used to know so well; how to get IT to do stuff for you; which meetings are essential, which are disposable; who you should listen to; who you should pretend to listen to; who you should ignore.
As ever it’s the little things that make life interesting.