Finally got around to posting my first "How-to" thread on this site.
The following screen shots will show you step by step how to get to instanced Zul'Drak , Grizzly Hills and Dragonblight.
Needed materials: Elixir of Giant Growth.
First step is getting to DTK and zoning into the instance. Start by clearing and killing the first boss of the instance. Once dead, walk into the room to the right.
One in the room kill the 2 spiders to the left and follow the next Screenshot.
You should be standing on the ledge corresponding with my arrow. Jump up onto the wall and you should be standing half way on it. As seen here.
Hop up and run to the side a bit and snug yourself into the wall.
Now use the Elixir of Giant Growth and begin jumping forward. You should get stuck above the wall as shown here. *Note that this may take a few attempt before you actually get above the wall*
Now from here, turn your character towards the blue to the left, and carefully jump. No slowfall should be needed. You should land with about 5% of your health remaining, although slowfall doesn't hurt.
Have fun and explore!