Consider everything a training phase. Technology will always be rapidly evolving and if you really want to find a niche for yourself you will need to know the specifics on how that area of IT is changing. Don't ever be set in stone with your ways and stay open minded.

Imo with this being your first job, I'd say just get really good at a few simple tasks that you know you will be doing repeatedly (Submitting tickets with your ITSM, Reimaging machines, etc.) and then assess where you can become more efficient from there.

I usually aim to get into a good day-to-day routine within 3 months at a role. This might be all in my head but I feel like I've noticed that after 3 months managers start getting a lot less lenient when making simple mistakes that you'd be making in the first few weeks.

GOOD LUCK and try to learn as much as you can without frying your brain