I think you might feel apprehensive because you don't have experience but after a few runs you'll start memorizing mechanics enough that you'll feel a lot more confident about it. So my advice is to just read up or watch a video on the fight you want to learn and then DF it a few times. After you get some experience and build up that confidence in how well you can tank the particular fight, maybe start a PF or ask FC mates to join you for the win. Best of luck with it!