I have been given the following image

http://i33.tinypic.com/2m61ixy.jpg

And I need to change the person in the image on the left as well as removing the reflections in the windows/Doors.

What would be the best way to do this, I have looked everywhere for a tutorial to do this, so if you could help me that would be very apreciated.

I do not want anyone to do it for me just explain how I would do it, or point me in the direction of a tutorial or write one.

Kind Regards

Is there no one that knows how to do this?


Please help me.

Regards.