You can hire a professional (cannot help with that) or you can undertake the project, if you have the inclination and time. There is a very useful tool called RoomEQ Wizard which is freeware and you would only have to buy a mic and preamp or, at least, a Radio Shack SLM. There's lots of help and discussion about this and its applications at:
http://www.hometheatershack.com/roomeq/
http://www.hometheatershack.com/forums/rew-forum/
Kal
http://www.hometheatershack.com/roomeq/
http://www.hometheatershack.com/forums/rew-forum/
Kal