Read your band saw's manual thoroughly and be completely familiar with its controls and safety considerations.
Unplug the band saw to avoid accidentally powering it up. Put on your safety glasses.
Install a blade appropriate for the task at hand. For complex cuts with multiple angles and curves, you'll want a thinner blade. Use a wider blade for thick boards and straight cuts. Consult your manual for installation procedures, as the process differs, depending on the make and model of the band saw.
Position the board against the blade, then lower the guard until you have approximately 1/4 inch between the guard and the board. Lock it in place and remove the board.
Plug in the band saw and turn it on.
Slide the board into the moving blade and maneuver it to allow the blade to follow the desired cut. Use your fingertips for maneuvering, but don't allow them to get too close to the blade. If necessary, reposition your grip, so you're always several inches away from the blade.
Turn off the band saw and unplug it before removing scrap wood from around the blades.