First, hardpan all instruments right or left apart from the kick drum, bass guitar, and vocals - leave these within the middle. Discover the loudest and quietest elements of the music and create two-loop markers. Bring all your instrument faders down. Next, on the loudest part of the music, set the vocal fader so that it is level dances around -20 dBFS. Now change your output from Stereo to Mono, utilizing a plug-in, stereo fader panning, or your console's mono button in case you have one. Flip the vocal volume to a ‘can simply make it out’ level and begin to bring up the other faders so you'll be able to hear every instrument within the music. Do that for the two loops you made earlier and adjust to discover a pleasing balance. Now turn the volume again as much as your normal monitoring level and change back from mono to stereo. You should now have a reasonably good preliminary mix balance. End this process off later with some automation when static fader levels make one instrument too loud or too gentle when they should not be.