First off, what are you mixing on/in?
The simple solution, if you're mixing in the box, is to turn down the master bus until you're not in the red. I try to keep my peaks at -3db, which leaves me plenty of headroom for mastering.
The key here is, TURN IT DOWN. Sometimes when I'm mixing a track, I'll have my master bus turned down to -9db so I'm in the clear. You can simply turn up your monitors to make up for the lack of volume while you're mixing. You shouldn't ever really incorporate a limiter in your mixdown process, that's a great way to piss off a mastering engineer like myself.
You want to preserve as much of the dynamics as possible when mixing. You'll gain back your volume loss in the mastering process through compression and limiting.
So, to keep it simple... Turn it down in your mixing console to avoid the red, and compensate through your monitors during mixing. Don't use a limiter during mixdown, as you'll gain back the volume loss in mastering.