To follow on from this, after the first week or so, parties running the fights blind are typically in the minority. Most of the time there’s been established strategies to handle fights (these can vary from DC to DC) and people will follow those strategies.
With that in mind, watching a guide to the fight is very much normal so don’t be afraid to do it unless you plan to go in blind! (And if you’re just starting out in savage you’re probably not in that group unless you’ve got a couple of friends you want to try it with).
Basically though think of savage as a dance. You need to learn the choreography. Once you’ve done that, then it’s a case of optimising your damage output while performing that choreography. The randomness in the fight is typically just whether you get sequence A or B first, so if you’re comfortable with the memorisation of mechanics, and then repeating them over and over until you can do them on auto pilot, you’ll do fine 😊
(If you’re a healer or tank obviously you also need to be doing healing or tanking as well, so factor that in to what you need to learn!)