This. When people are new to some content and don't say a word about it because they expect to "wing it", thats when it can annoy people who already know the fhe instance, and its understandable.
You have two options.
1. Make a blind training party on PF.
2. Go on DF. But, by doing so you agree to let the others know you're new and that you will both ask for advices on what is coming and follow them, weither it will spoil the fights for you or not.
As i said going on a new instance through DF and not warning others and potentially waste experienced people's times simply because you didn't want to spoil the fight is selfish.
Im a very patient guy, but if you do keep failing because you didnt ask or follow my advices i for sure will rage at you.