Congrats! I remember not being able to do it all at once when i first hit 80. I ended up slowly gearing out toons, did some guild raids, and a lot of pugs before i had the gear to have it on farm. Kudos to getting a heroic down so soon after hitting 80, thats a real accomplishment.

A guildie of mine had to kill Loken something like 30 times to drop the defense trinket... I got it on my 3rd or 4th loken kill. It will only get easier for you, once you start equipping the badge gear, which is all better than anything naxx has to offer, even in 25 man.

Also, make sure you do Direbrew as often as you can, those stamina trinkets are very nice to have, I currently stack 2, since getting more DEF on other items. The other trinkets are also very nice, and much easier to obtain than the badge ones, given the way the new badge system works (it seems a shame to have to downgrade badges to get mediocre gear, instead of using the badges on really good stuff...)