Good advice, Simcha. and I hope it helped to ease your worries.
If it's anything like my eval was, it was actually very impersonal and we moved through the various stages fairly quickly. I found it much easier than my dealings with the VA.
These people have several appts a day so they do not waste time...
State laws on this don't vary that much, I don't believe. You have legal rights on seeing the results of the eval once it is processed...your T can also ask for a copy and dispute anything he feels is grossly wrong.
So you will have someone on your six...

One thing I would like to say is how you present yourself will be noted...yes the expected nervousness but also your body language, personal hygiene, impulse control (temper), general attitude so to speak. Be honest as lying is almost always picked up on...
As already suggested, military mode can be beneficial...I'm sure you've probably been through your share of "Mickey Mouse" things and can handle this in the same way.

Perhaps gathering what support you do have irl would help...do what you can to be your own advocate...keeping up with your attorney, same thing with your T...anything else you can do, do it.
Your court appointed attorney has to respond to your questions and requests for information...just expect to make a few calls before he gets back to you. The waiting game...

Acupuncture and massage therapy are excellent stress relievers. If you opt for a massage, time it so you can go home and take a shower at minimum...a short soak in a very warm salt bath is recommended with peroxide added the last few minutes you are in the tub. I was told it helped dissolve any toxins that were released onto the skin by the actions of the massage.
After I had mine done, I slept for nearly five hours.

Brain games are good for keeping you focused on them and off your worries. There are many sites that offer a variety of them...Fit Brains is one of them along with what Yahoo and MSN offer.
Another benefit to these games is they can help your critical thinking skills.

I add my thanks for your service also...
I'm finding out there are many of us Vets here at PC.

Best wishes,
Catherine