We are attempting to hack our way through the jungle undergrowth of perfectionism with our DD (11, nearly 12);
while
Living with Intensity and
Misdiagnosis/Dual Diagnosis are both really really good tools, and I recommend both...
I also encourage anyone dealing with perfectionism to do some additional digging about
when to get professional help.
With the inwardly-directed, performance avoidant variety (self-handicapping, underachievement, procrastination are red flags here), getting help may be essential, since most of the time that particular constellation of factors doesn't respond well to anything but CBT in the hands of a pro.
Most of the leverage that we as parents have for managing the problem are double-edged swords that also have the potential to make the problem WORSE instead of better.
{{hugs}}
(You might look at the last few pages of my thread "Deterioration" re: my daughter for more references and tools. Lots of people had wonderful advice.

)