You can do it! “What if” isn’t a good attitude. Do your best with intent to succeed. You might just have to work long hours in the beginning learning all this new thing. In a way it might be helpful to be home all day and not having anyone bothering you.
My nephew moved across the country for a new job right before pandemics. When he arrived he had to work from home because his arrival coincide with a lockdown. They gave him tasks that he didn’t think he’d have to do. It was quite different. Since he was by himself and all alone in his city and on a lock down he just worked 12 hours a day learning stuff he apparently didn’t exactly know. He was freaking out a bit. After awhile he was good. Now a year later he is not having any issues at works all day.
My husband just started a new job this fall and even though it’s the same field, this hospital does many things differently like totally unfamiliar equipment, unfamiliar procedures, different data system, different policies. He was freaking out that he is too old for a change. But he seems ok now. Although he is still obsessing but that’s a given.
New jobs are stressful. No way about it. But every job was new at some point and then becomes familiar and you learn things. You can also ask for help on things, not complaining though. You can do it!!!!
Those of us who have to work for a living and aren’t independently wealthy just have to keep swimming. Just have to. You can do it