It doesn't matter too much. Key thing is your pen is fairly upright and that you are not gripping too firmly. You shouldn't really be needing the support though. One reason for learning to draw from your shoulder is to build all your muscles so that you are only very lightly touching the paper thus allowing the pen to draw freely.

Also remember that anything new feels uncomfortable at first. I have been learning the Proko style artist grip recently and I started off really struggling. Now it feels uncomfortable to go back to my normal grip.