Heroism at 70 makes life a lot easier. Just remember you have it on all of your characters and can use it for any tough pulls and bosses. Once you get to 70 this instance will be cake. If you can afford it get the spellpower enchants on all of your gear and weapon. That helps too. Since I hit 70 I've been able to do all of the 5 mans and have finished a few heroics. I only have a couple of epics and the rest of my gear is the blue PvP gear. I can't wait to get a little bit better gear.