At step 1.4, what is the proper way to install 4.8 to the Mingw folder?

I think this was where the issue of not being able to find the boost files came from for me even with the correct paths. I copied them to the mingw32 sub folder instead of the main bin folder.

Is it best to copy all folders in the gcc 4.8 download and merge them with the existing files in the C:/Mingw/ folder?