Yes
Yes they hurt, atleast with winny, but if you're mixing it with say...eq or something like that it's not too bad. As far as the lumps go, you just really have to massage the area good and hard after injecting and it keeps any lumps from forming for the most part. Also, try not to inject in the same spot 2 times in a row, move your injections around a little. Take care.
patk