Hi Lee,

The girls have described it all very well - I do agree that it's worth getting attuned to level one in the long run, then you can use it on yourself whenever you like and whenever's convenient instead of waiting for an appointment. Also, being attuned raises one's vibration somewhat. Black clothes won't affect anything, the energy just goes straight through, even through solid objects such as the chair back in a seated treatment.
The practitioner may ask you would you prefer light contact of the hands, or for the hands to be held an inch or two above your body, I usually do ask, I know some people are more comfortable with the hands held slightly away from the body, especially for the head positions. It'll be as effective either way, it's all a matter of choice. You'll probably have to take your shoes off, not sure if someone's mentioned that to you already.
What you might experience ranges from physical sensations, heat, cold, tingling, a sensation like a gentle breeze, waves of energy flowing through and around your body; you might see all kinds of colours (purple is a very common one) or pictures, scenes like a movie playing or like a dream. The practitioner will probably talk you through all this. You might feel different emotions too - it's not unusual to feel like you might cry, or to laugh out loud, again it's quite personal. I didn't feel anything on the emotion side after my first few sessions but I had all the physical sensations and visuals described above. I sometimes feel like I'm somewhere else, for instance I had a really strong sensation that I was in a field lying on my back on the grass with the sun shining on my face once, I could even smell the smell of grass, and 'sense' insects flying close to me. It was cool :)
After your session it's advisable to chill out for the rest of the day, drink lots of water and generally be nice to yourself so you can fully enjoy the effects of it (- eg. I wouldn't go see anyone who makes you tense or watch an upsetting news programme or read a Stephen King novel after having a treatment!)