First Crossfit session, any advice?

Sciatic pain. I wouldn't go without a doctor's approval. Is this your first time out with an exercise/weight loss program. Gentle changes can be just as effective when you're just starting. Don't overdo it.

Let your trainer know about your issues and concerns. 2 months is still a newbie, so ramp up slowly and be sure your trainer is on board with this. Ditto about getting doctor's ok.

I’ve been doing CrossFit for about 1 1/2 years. It is great for me. I went from total couch potato to CrossFit 5 times a week. Lost 106 pounds in this time- changed eating habits of course but the CrossFit workouts sparked the eating changes- not the other way around!
- be very straight with the coaches. Explain your goals- long and short term. Tell them about your sciatica and any other health issues no matter how insignificant you might think they are.
- Truly leave your ego at the door! Don’t think “I can do the same as the others.” CrossFit is a sport that takes practice. If you were training for running you wouldn’t expect to run a marathon in three hours the first time out.
- Don’t be afraid to scale. ask the coach to guide your scaling.
- You will be sore. I was unbelievably sore because of my bad fitness going in. Buy a foam roller and use it. I hadn’t used some of the muscles involved for years.
- Remember that most people in the session appreciate the effort- not the “score.” They’d rather see a fellow athlete use good form and lift light or finish last than be a mess with a stupid high weight.
- Give it a few tries. My gym let me have three free sessions and then gave a discounted first month.
- Enjoy it! It is fun in a strange sort of way.

Good luck!