I assume you mean the fishing bot, since I doubt you can get banned for fishing only
From what I know, the fishing bot isn't detected by Warden at the moment, so the only risk of banning becomes from being reported by other players. You should check the places mentioned in the guide to see if they are crowded or empty. If there aren't people around, you should safely be able to fish and no one will bother you. You might want to put on /dnd with some fake reason though, so people on your friend list or guild won't bother you either.
If you are unsure, you can leave the bot fishing and stay near the computer so if someone whispers you, you can whisper them back and seem like you're doing all the fishing by yourself.