Not too bad.
I kind of dislike the installer though (after you complete each step you have to go back to the main page to do the next one, it’s more a nitpick on the UI flow).
Getting everything working is easy though, basically just click which disk to install and add a user profile. Click install and then click restart when done.
Overall it feels modern and normal.
If you have secure boot you might have to go do something in the bios, but there are usually guides, and windows would be the same.