I just recently incorperated front squats into my routine.
And in order to do them correctly I googled the from you should have while front squatting.
I tried placing the bar across my shoulders and crossing my arms around the bar. I found that it was a little unstable, but maybe that is just because I'm not used to em.
I also tried holding the bar up with my hands turned up with the bar across my shoulders, this seemed harder and placed alot of stress on my wrists.
I didn't use that much weight either. I would guess I just need more practice?
BTW my hamstrings kill, after only doing 3 sets of 5 I was killing.