I took this shot before I started so I could sort of plan out how I was going to do it.
>>6769257I buy packs of mechanical pencil eraser refills. I used about one total, because I used up two pieces that were already about half-gone when I started. I didn't mention this in my heresy tutorial, but I use a comfortable pencil to hold the eraser so I don't have to grip the eraser directly with my fingers.