You may need to sit down with the photography professor, at least. Don't try to explain everything about AS; too much information will just get in his way. Professors are busy people, although they really do want to help you. Write down exactly what the problem is with the instructions you are being given and have a solution to the problem ready to give to him when he asks what kind of accommodations you need. For instance, are the instructions being given verbally or in writing? If they are being delivered to the class verbally, it would not be unreasonable to ask that he -- or, rather, his TA -- type a handout for the class for each assignment. This would likely be of benefit to the entire class.
If the instructions are already delivered in written form, but are in paragraphs, try sitting down at your computer and re-typing them on your own with each sentence as a bullet point. If you still have trouble understanding them, take them to the professor during his office hours and ask him for guidance. Don't, however, just drop them on his desk and say, "I don't understand any of this." It will be interpreted as being aggressive and troublesome, even if you honestly feel completely overwhelmed. Try to have specific questions about the things you don't understand.
There's not much that can be done about the noise level in the classroom, especially if it is a lab class where people are working on their projects. Some people learn best by interacting with others in this kind of environment, so you can't ask them to stop doing that. However, you can politely explain to your professor that you sometimes have trouble hearing during class. (This may be another good argument for the written instructions for projects.)
I hope this helps.