You absolutely do
not need a static. You absolute do
not need to be in voice chat.
I've been progging and clearing the current tier in Party Finder as a solo player. And there are plenty of statics and FCs that end up filling in slots via Party Finder because they don't have a full group of eight. Some of them offer voice chat; some of them don't;
none of them require it.
That
is, more or less, how the fights are designed. You just need to remember that the normal mode of the fight has simplified versions of the mechanics.
The other thing to remember is that SE has their go-to gimicks for extremes and savages, just as with normal-mode fights. With experience, you'll notice what they are.
===
I think whole "required to watch a guide" thing is overblown. The typical
Hector video is maybe 15 minutes. Watch it once. Take two minutes
here to get some idea of what the shorthand in PF listings means (you can definitely skip over all the "raid plan" links and whatnot; I do).
Congratulations! You've "watched a vid" and "studied the fight." The rest comes from jumping into the fight. First-hand experience is, ultimately, the best teacher. Videos and guides merely plant little seeds in the back of your mind for what to expect; no one's going to ask you to stand in front of the classroom and recite them back from memory.