Integration of Simple Machines Forum into WordPress site

I run an website with wordpress as CMS. So far all works fine and I could do the basic customizations myself. Now I want to integrate a forum in my site. After looking at a lot of different forum scripts I have chosen Simple Machines Forum. [login to view URL] The forum is installed and working. The problem is that I do not know how to get this into my existing wordpress layout. I want my header above and then there should be the forum. To achieve this the main php file from the forum software has to be modified and the code of my header from wordpress added. Should not really be a big deal, but I am no css pro header, so somehow my result is not looking too well... If you know CSS well and can do some PHP it should possible to get this fixed. Please read first my requirements: - Wordpress expert - PHP expert - CSS expert - Experience with the simple machines forum software is a plus. If you meet the above requirements please give me some exampels of your existing work. Thanks! Regards, Alex