I think calling the Crystal Tower series "easy" is just because almost any random group of players will finish them with at most one or two wipes.

But even experienced, well-geared players who have done them a hundred times sometimes die, and sometimes it isn't their fault. There are some mechanics in some of the fights, mechanics that aren't your responsibility to do, that can sometimes bite you hard. For example, IIRC, in the Phlegethon fight, if another Alliance doesn't get enough people to their circle when the boss casts Ancient Flare, it's a wipe.

So don't sweat it. I die, you'll die, or everyone will die, but it's no big deal. Even if you die several times in one fight because you can't get the mechanic down (like in the Angry Menu giant-eyeball fight), it's fine. It's expected.
And you'll still almost certainly clear the raid in less than 30 minutes.