installing window run channel

ok i need to install a window run channel on my driver side. i have no idea on how to do this. i guess i am asking is this hard to do, i dont want to try and have all of the crap fall out of my door. Um if you guys with the helms could check it out that would be cool to.

I plan on buying one of those manuals someday i just keep having tofix normal crap that i dont get around to it.