Rosebud, I have had them in a shoulder.
Before I went folks told me all sorts of horror stories, rather unkind really, but I didn't find it really painful at all. I did however get good relief. I had about 4 lots over about 18 months I think. I had very quick relief with one I remember but most times it took a few days to kick in.
Don't listen to the negative bods, just keep a focus on the fact that it will probably help a lot.
XX Jeannine