I've wanted Terrorpene since I first saw the picture here on petopia and I was so excited to finally be able to play my hunter once my priest was leveled up for raiding. I knew I was coming to Hyjal and while I've seen him here and there with other hunters I've never seen him in the wild and I couldn't wait for my chance to camp for the flaming thing.
As I researched, I became nervous. I've never been one to wait and I wanted him right at 80, so having to wait until 81 was a torture in itself. I was even more worried that my relatively small health pool at 81, (About 38k) would be a major issue. I had reason to worry too, I've heard about hunters losing their chance because 10k ticks per second of fire gave you seconds only to tame and with a non-hasted cast time of 10 seconds on tame beast, it just wouldn't happen.
So, I ended up looking from 81, to 82 and then at 82, I just camped. I purchased some prismatic elixirs from a guildie, crafted some drums of forgotten kings, scoured some old haste pots out of the guild bank and made temporary friends with a local core-hound so I wouldn't lose my old one in the rush. I set up a special tame beast macro using one on a previous page;
#showtooltip Tame Beast
/cast Ancient Hysteria
/script PetAbandon()
/use Potion of Speed
/cast Deterrence
/cast Tame Beast
...and then organized my things in the bag so that I wouldn't panic when it was time. As I sat and waited, I saw a lot of other hunters around, even more than I remember for Skoll and what really worried me, was the amount of non herbing/fishing/mining non hunters that I saw. They were all cruising the points for Terrorpene too, so I couldn't help but wonder if it was for the 25g vendor trash he dropped on death.
Anyhow, as I was camping the n/e most part of the lava, I landed and cast my drums, just in case and then decided to take a jaunt over the lava. It was as I was headed south along the eastern bank of the Throne of Flame that my NPC Scan went off.
I must be getting pro at this because I didn't even panic. I swung around (He's not as big as people will lead you to believe and even on ultra-graphic settings, he can blend in with the lava) and settled down on the rock nearest him to begin the tame. I opened my bag, drank one elixir, made sure my core-hound was out..(He was, I didn't want to risk panicking and accidentally abandoning Loque'nahak instead, so I had gotten the core-hound out in advance) and blew the macro.
Terrorpene hurt, I'll be honest, but I think my preparations made all of the difference. Using the drums + the elixir, I was resisting 5-6k of his Burning Hatred, which during the course of the hasted Tame Beast cast, ticked for 5 times. At 10k per tick un-resisted, that would have killed someone who was completely unprepared in the same amount of time. At 82, I had 46k life with a few trashy pick ups from quests + the drums. I ended the tame with 26k life left, roughly, so he ate through nearly half of my life with the FR. I wouldn't want to be that person who fails the tame to death and ends up watching their beloved pet-to-be, going off with someone else.
Luckily, preparation favors me again.
...and just in case you like a bigger picture;
http://img264.imageshack.us/img264/2205/terrorpenel.jpg
and proceeded to fly down and tame, I had less than a 1/4 of my health left but very happy. 
