Hello Laura, I've just installed guix on debian. What I did: installed guix using the script, then guix pulled. Then did what it said on the final line: added to $PATH the .config/guix/current/bin stuff. I also added that to the thne non-existent .bash_profile Then ran guix pull again, it did the profile migration. Then ran guix pull again, and it did not want to do the profile migration any more.
I will report back, once guix gets an update and the next guix pull does something, but it looks good so far.