I switched from LastPass to Bitwarden, years ago now, and the whole process took roughly 5 minutes. I'm not sure if something has changed since then, or if it's more complicated to switch to something other than Bitwarden, but my experience is that it at least can be simple.
I couldn't upvote or comment until I added a lemmy.world account. Now it seems like I can upvote and comment from my Beehaw account? Definitely strange, but the app is clearly in development, so hopefully that's an issue that gets ironed out quickly.