Originally Posted By: Guitarhacker
My advice on harmonies is simple. Do them live.

^ This^

If you use a harmonizer, this means you can sing. And if you can sing, you can sing harmonies.
Even if they are vocally out of your comfort zone, they are still much better than anything you could do with a harmonizer.

Also, harmonies in general don't have to be outstanding (sonically) to work.
That's not true of songs like the Everly Brothers or Simon & Garfunkel, though. But even there, one singer was always the weaker one.