Tips for adjusting to new skates

Hiya, I'm a beginner adult in the LTS program and last week got my first skates! The fitter put me in Jackson Elles, they were heat molded and everything, and he did tell me it would feel a lot different than the rentals, but I don't think I was prepared for just HOW different lol.

I genuinely feel like i've lost all my progress, i feel unstable etc and my stops are completely 100% locked -- my edge just sticks in the ice and it makes me nervous i'm gonna go tumbling haha, not to mention that the arches of my feet absolutely kill me when I'm skating now (but the fitter also said something about analyzing the blade alignment and punching out the boot so i'm going to assume that can be resolved)

Anyways, are there any tips for adjusting to that major change? Is it normal and just something i'll have to skate through for a few weeks?