You want to get skilled in texturing?
I practice in the following way. I load a zone from Blizzard with a texture set I like or I want mine to look like. Then I delete the texturing on some chunks with noggit.

>> CTRL + SHIFT + left mouse click on 2 till 4 connected chunks.



Now try to recreate this chunk texturing that you don´t see they ever where deleted and orient your work on the still existing textures on the surrounding chunks. This way you learn the technics Blizzard use, learn how they work and experiment around how you can recreate them with noggit. During this process you will get better and better and get your own style doing texturing.