When you're checking your final mix, be sure to check the mix on several systems.
Make a ruff mix and burn it to CD. Now, listen to it in your living room stereo. Can you understand all of the vocals? Listen to it on a boom box. Can you hear the effect you put on the bridge vocals? Should it be more pronounced or mellower?
I assume you've got the friggin' rhythm section right. What remains after that is placing leads (both vocal and instrumental) and overdubs. Cut bass frequencies out of double tracks, ad libs, and echo tracks.
If you're working with a 2-track instrumental (as many of us must) you may need to slightly cut some midrange frequencies. Use a freq. analyser if you must, but clear a little room fo0r the vocals, It can make a big difference.
Me so sleepy-
-Hoax