You don't say what kind of camera you're using; a TLR or other camera with a WLF is inherently quite stable, and I can usually manage shutter times of 1/8-1/4sec. Others claim much better results than I can attest, but they may be younger and more sturdy in their stance. I've got three or four monopods which I rarely use, but when I do, I often extend the monopod on an angle to the side so that it is less prone to lateral movement. It sort of acts like a tripod leg in that case, with my body weight leaning into the monopod, creating a stable platform for shooting. To be honest, I don't think my method is significantly better than a vertical stance, but I've gotten comfortable with it. Even with that, I would seldom shoot at any speed less than 1/4-1/2sec.