1st tip? listen very carefully to the music and make it sound good. Pay attention to the details early on so you can have fun and dance around as the mix comes together. Make the music sound as good as you can as a whole piece.
2nd tip? monitor through speakers QUIETLY. If you can't talk voer the track you are wearing your ears out.
3rd tip? take frequent breaks. Walk away, do soemthing else. You don't want to get fagiued and you don't want to get used to the sound of the track and start taking any of it for granted. GO sltien to the wolrd....
4th tip? half breaks. Tun the mix up a little bit and leave the control room and listen from anotehr room. You wills till hear it pretty well but almost every good record has a certain projection into another room and if way that's a good sign for the overall balance. If it soudns weird in another room I'll ebt some of the issues will jump out at you with the air space diffusing the sound out. its weird, this helps and its easy on your ears.
and tip 5? don't work on any mediocre music. A good song with a thought out arrangmeent starts mixing itself assuming it was recorded competently, but badly thought out music is notoriously difficult to balance. There is no 'fix it in the mix.'
you're thinking "hey, I was looking for specifics, I coudla thought of thsoe myself!" but you need to remind yourself to make it sound good every 2 minutes, for real.
here's my free mixing as science resource for you:
http://www.sengpielaudio.com/calculator-bpmtempotime.htm
you're thinking, dleay plugins sync? why do i need this? other thigns have time constants, dude....a ttack and decay on compressors? the release on an expander/gate, reverb tails (what about gated or expanded reverb, hmm?) helps topt it all in time with the music as precisely as posible and tweak from there. I could give you other science like tell you about the different types of dB or teach you how to calculate delay between a DI and a mic on the same instrument by getting the speed of sound using a thermometer and ... but for msot people this translation from BPM to MS for quarters, eights, tripelts and sixteenths will be the most sueful reference they have ever seen. For real. boundless apllications if you sit and think about it