Bring someone with you for support. I used to bring an advocate, but now I am so used to these meetings, I just go alone.
Don't sign anything if you don't agree or don't understand. You have a right to request a second meeting. You also have a right to bring along anyone that you want for support - just let them know ahead of time that an additional person is going to attend
I went to an IEP for my son at his new middle school a few years ago and I will never forget how disrespectful the assistant principal and psycologist behaved.
The psycologist and assistant principal were wispering to each other and rolling their eyes while I was talking. I was so offended (I am not usually confrontational) I had to call them out on it and right in front of everyone at the table, I told them that we were discussing my son's education and I would appreciate some respect. I told them that I did not appreciate their eye rolling and whispering during the meeting. From then on end, the principal instead of the assistant principal and a new psycologist attended my IEPs. And all the meetings with the new team went great - we worked together to help my son become successful in school.
So, stand up and advocate for your child - don't be intimidated by the group of teachers. Most of them are there to work with you. If you feel that they are wrong - respectfully state your point and if needed ask to reschedule a meeting and call your states learning disability association and ask if an advocate can help you out. Just bringing an advocate one time lets the team know that you are serious.
Just keep focus and remember that everyone at the meeting is there to solve the same issues. (But, keep in mind that special education is costly to the school, and the team is aware of this and will not extend themselves over the budget if they think that your child's disability is not "severe" enough. Just remember that even kids with mild disabilities can suffer if they don't receive the appropriate services.
Good LUck