You know what grinds my gears?

"Okay this fight is a total mess. I did it once with cousin's little brother's nephew who got shot in the leg once for robbery. She got in county for 24 hours but we paid the cops LOL. Anyways, she's fine. About the dungeon, the boss is a tough crap, keeps on doing aoe stuff so dodge a lot LOL or you die. Someone has to get the rocks (or crystal or whatever) and drop in the sand. I don't know when though but I did it like a long time ago when my brother was looking over my shoulder (he's a bit of a perv to tell you the truth) and I went in as healer to heal. I was bad at healing so we wiped a couple of times LULzzzz... Anyways, healer has to get the rocks and put it in front of the worm (i think?) and there would be adds.)

That all can be shorten to:

(Healer gets the crystal and put in on sand when worm search for fodder. Kill adds.)

They go ON AND ON AND ON AND ON... only to point out a couple of things. It's such a waste of time and the newbie will probably be like "What the heck is this guy saying?" and be more confused than before.

Newbie? Explain briefly and make compact. The Steps of Faith gets me everytime (amount up to 10 minutes for someone to explain it when I can do in 1 .)

"One healer, one tank on cannons please. One DPS has to get up tower and fire dragonkiller. MT take adds towards the front of boss and cannons kill them. DPS, go DPS on boss only."

As the rest of the fight, I explain how to fire the dragonkiller and the snare mechanics.

tl;dr Don't take too much time explaining. Use fewer words.