We night-weaned at 9 months, when I just couldn't face another 3, 4, or more months of waking up to feed 3 times a night! Lilah slept well from about 2.5 to around 4.5 months, then we hit a growth spurt, then milestones (sitting, then crawling, then first teeth at 7.5 months. I was nursing her back to sleep every time. By 9 months she was waking more often than she did at 2 months! So I used the PU/PD program (along with restarting EASY, as she nursed to sleep for both her naps, too, after I had so successfully gotten her to put herself to sleep by 2 months-- but things fall apart). Dh helped out for the first couple of nights, but as I was using PU/PD during the day for naps, too, I had to do it then. It took awhile (probably 5 days to start into a routine, but I wouldn't say we were "set" for around a month). I continued nursing during the day, just not around the times she would be going to sleep. The first night it took proabbaly 2 hours to settle her after a night waking, but then, miraculously, she didn't wake up again to nurse the rest of the night. (My boobs were exploding!)
Anyway, by no means do you need to totally wean to get some sleep. Just readjust the schedule so she gets used to nursing only during waking hours, and keep your breats under wraps for those night wakings. As soon as you offer the breast, you'll be back at square one (at least when you're first night weaning. I have nursed her at night a couple times on camping trips when nothing else would calm her, but had no problems returning to the original schedule once we got home).