As others have said. A big sturdy tripod with a quality head are a big help. Then it possible use a remote to fire the shutter. You also want to look at ways to dampen motion. One way is to hang a weight from the center of the tripod. Lots of shooters will just hang their camera bag. You can also try laying your non-shooting hand on top of the lens to dampen motion. If your body has a live-view type feature you may be able to use that to fine-tune focus, especially if you are using a shallow depth of field or in my case a manual focus 800/5.6.