Mixing is easier when the tracks sound great. Of course, you want the music to sound good when you’re recording it, but editing isn’t something you want to slack on either. Make sure you get rid of any unnecessary noise.
If you’ve recorded multiple takes, take the time to make sure you are using the best possible take in every spot. If the verse was better in take number one, but the chorus was better in take number 3, comp those takes together and take your song to a whole new level of greatness.