@AnneiChan
Hmm......You needn't to be hesitant on what your gonna draw and picture the image of what your gonna draw, no distractions, you need motivation/inspiration, and all materials needed for drawing must be present. Then you sketch, when you draw the pressure you put on the pencil must be light. When your done with your sketch you can trace it with much pressure((but not to much)), that it can be seen clearly, and then you can color it((if you want to)).
I dunno....but that's how I do it....
Hope it helps!