I'm on Ubuntu. I've got my home on a separate partition. Is replacing Ubuntu with Arch as easy as wiping the root partition, installing Arch and mounting home as home? Wiping and re-installing Ubuntu (which I do every couple of years instead of a dist-upgrade) has always been remarkably smooth, as in it took like 10 minutes and I was back on a working desktop with Firefox restoring my tabs from the previous install.
Arch actually has a guide to do it from within the other Linux, which seems crazy and fun. https://wiki.archlinux.org/title/Install_Arch_Linux_from_exi...