As some have said in this thread, the main issue is the lack of official tutorials to help players understand the game. Bard is a very busy job, so it can be understandable that you get caught looking at your hotbar alot.
One tip i'll give for solo instances or any normal content duty finder content is to stop dps and focus on the mechanics until you feel safe to hit your buttons. In these levels of content, there is no damage check, so you don't have to try to damage the boss while things are hectic. Yes, it will take a lot longer, but you won't die at least XD.
good luck!