I sometimes see anger at myself as being justified too. I have had to ask myself "well, frustration at repeated mistakes may be understandable, but what am i going to DO with it?" Just repetitively beating myself up on an emotional level doesn't accomplish anything to alleviate what I'm angry about.

I've tried the puppet therapy once - didn't do anything for me because I didn't really grasp the concept at the time. I've used the empty chair technique on myself - no therapist present, I read a book and thought "hmmm, let's try that!" - and that was an eye-opener. I apparently have some interesting "baggage". >.<