Practice your intonation and pitch control very carefully, ensuring that you are consistently landing on the correct notes. Although correction utilities can fix any number of mistakes made during the recording process, they cannot disguise similar problems in a performance environment.
Attach a "pop" filter to your microphone when recording vocals to ensure that any sudden bursts of air from your mouth or harsh syllabic pronunciation will not be captured in the recording. Large music equipment vendors stock a variety of pop filters.
Plan where you will breathe in the song during your practice time in order to create a consistently successful approach to the music. Entering a performance with this security will greatly improve your confidence and reduces the physical effects of insecurity such as nerves and stage fright.
Record yourself during practice and performance so that you can review and critique yourself at a later point. It is often the case that musicians leave their performance with a very different idea of their overall sound than that of the audience. Recording yourself allows you to approach the music with an objective, critical eye. Take note of problems and errors needing improvement.