I didn't have any trouble with my Vista installation on my MBP. In fact, it went smoother than installing XP on my wife's MacBook. Simply follow the BootCamp instructions and you should do fine. (But, I think I'd wait until after finals - just in case.)
Since you've got the 4GB of RAM, you'll really do better with Vista since it will address all 4GB of RAM (instead of 3.3GB). Also, if you go ahead and move to the 2009 AutoCAD version (get the student copy) then a 64-bit version of Vista will recognize the software as native 64-bit code and allow the program to access more RAM. (32-bit Windows only allows a single program to address 2GB of RAM.)
Feel free to PM if you've got more questions or need a more detailed response.
Since you've got the 4GB of RAM, you'll really do better with Vista since it will address all 4GB of RAM (instead of 3.3GB). Also, if you go ahead and move to the 2009 AutoCAD version (get the student copy) then a 64-bit version of Vista will recognize the software as native 64-bit code and allow the program to access more RAM. (32-bit Windows only allows a single program to address 2GB of RAM.)
Feel free to PM if you've got more questions or need a more detailed response.