I started doing Heroic Gundrak 3 bosses first, since my gear was ubercrap at 80 ding. Then i advanced to full run Gundrak, and started doing Heroic UP/UK. After farming those a while, i could easily clear most heroics.

If you are having trouble...check out quest-gear. There are alot of good upgrades from elitequest/chain-quests, if you newly dinged that is. And don't do think that small upgrades don't matter, because they really do. e.g +16 SP from an item, x4 mean your group will have 64 more SP all the time. You wont notice this for each upgrade ofc, but after a when it adds up...oh boy!

And ofc, skip most of the trash. Gundrak you can skip almost anything with jumping down in water after snakeboss, running up to the golem/water elemental boss (You will pull adds if you do it this way, but when u get gear this is eez) then swimming to the next.

Also, don't give up. Once you get the hang of it, heroics go FAST.