Well...it's been a
long time since I actually learned how to read music, so I can't really give you any suggestions on that. However, I have struggled through piano (and boy what an ordeal that was...), and basically I have one suggestion: play what you like. It's the simplest concept that many teachers who work with young kids employ -- and I discovered that it's also what I had to use on myself to get down even the most rudimentary of piano skills.
I had to go out and find (ie: download) music that I was familiar with and/or liked in order to make it easier to learn. Pick something you're really familiar with, and try to play it with the sheet music.
Good luck. It's kind of hard to teach yourself, but perhaps that's just because my instrument
(the viola) is a little harder to self-teach

.
Jam it back in, in the dark.