oh i guess i never posted about how testing an instance went but it worked! i got it up, tooted into the void b/c i haven't allowed other people to join yet, and went to get tacos.
now that i know i can do it i might look into grabbing an actual domain and setting something up, ideally based around a specific community (thinking libraries/librarians - i basically never use my "professional" twitter account b/c it's so busy, it'd be neat to have lower-key library chats)