It's not that bad at all. Unless you mean the manual installation. You don't have to manually install Arch anymore (but it is recommended to try for people who want to learn) You can use the new, official guided installer or one of the many unofficial installers. Or you can use another Arch-based distro (like I do for my PC) I didn't do the manual install because I didn't have the wifi driver I needed at the time. But for manual install, the Arch wiki is very good.
That first thing depends on the laptop. I can run Windows in a VM on my laptop just fine with KVM.
Second thing is entirely true. My laptop is setup to dual boot Arch and Win11 (though I don't know why I bother keeping Win11 on there. I haven't used it in months)
I like KDE, but I'm too used to i3 now