Practice, practice, practice!

Wake up, eat breakfast, practice practice practice, eat lunch, practice practice practice, eat dinner, practice practice practice, brush your teeth/shower/other hygiene related stuff, practice s'more, sleep, repeat.
But seriously, practice is the only way you'll be able to get it down. A good approach is what SuperDuck suggested.
Personally, I'm an arrogant little poop at times, and refuse to practice them seperately. I dunno why, but I just like to try & put it all together at once. I eventually find how the lyrics flow with the rest of the song, particularly the bass line, and then it becomes a matter of hands-voice coordination.
Sometimes, though, it doesn't quite work. I found for a few songs I couldn't help but end up singing the harmony, and would've made a great backing vocalist in those songs.

That reminds me, maybe I should start singing the harmonies for those songs in
The Whereabouts of Wally Dudes. It'd sound GREAT in the slow love songs...
of course, my voice still doesn't compare with the 2 lead actors', and they're 5 years younger than me!
