I often tell my husband he'd better hope i'm not in a car wreck...as I sometimes have 3-4 of varying stages of blue, purple and yellow on my stomach at any given time. Looks like i've been punched a few times

...but they truly don't hurt.
I do hate when I hit a vessel though....OUCH!
I still don't change needles but about once a week...I keep the needle in my pen, and don't usually have an extra with me.