Assuming that you can find an employer who needs your expertise then I don't think it should be especially difficult. At least it should be easier than it was when I moved here in January 1986 when I had to provide the Norwegian Embassy in London with a stack of documentation proving that the company that was going to employ me had tried for six months to find a Norwegian who could do the job and failed before they would issue a work permit.

Anyway, Norway is a very transparent society with a well integrated government web site so you should be able to find the details here: https://www.udi.no/en/want-to-apply/work-immigration/