I finally took the time to try working out how to set and make the background for the new Youtube (I much prefer the old one ><"), although it took me a little over 3 hours- I have ecstatic about the result! It doesn't look pro by any means, but I'm very happy with it! Mainly because I did it all myself ^^ I always get that strange wash of happiness when I do something and succeed, especially if I worked hard on it.
I also changed (well technically speaking I added) my cover photo on my Facebook page while I was at it ... This one was much easier considering the dimensions of the page were smaller so I didn't have as much guess work to do.