Lyrics:
http://www.eltonography.com/songs/dont_let_the_sun_go_down_on_me.html
Tabs & Chords
http://www.ultimate-guitar.com/search.php?s=Don%27t+let+the+sun&w=songs
(Careful with those, they sometimes put up crap)
Videos:
http://www.youtube.com/results?search_query=don%27t+let+the+sun+go+down+on+me+elton+john&search_type=&aq=f
There might even be some instructional vids in there. That's going to be a hard song to pull off on guitar, since it is so piano-centric. Good luck!
p.s. They can't provide lessons to songs without arranging permissions here because of copywrite issues. Hope the links help!
...so ever since then, I always hang on to the buckle.