Reciprocating saws have the same motion as a handsaw but, because they are powered, cutting with them can be much easier and faster. All reciprocating saws also have a "Reverse" setting that will let you change the direction the blade moves to make overhead cutting easier. Only Bosch reciprocating saws have a unique toolless blade changing system that makes using their saws even faster because you can change a blade with one hand and keep on working.
Hold the saw so it is braced against your body and pointed out and away from you. Do not hold it near the trigger, but support the saw by holding it by the body.
Locate the locking collar for the toolless blade changing system. The collar is the thick ring around the base of the blade where it enters the saw.
Grab the collar with one hand, pull it toward the body of the saw and turn it counter-clockwise at the same time. The collar will loosen, and the blade will be ejected by the spring mechanism inside the collar.
Insert your new blade into the collar and turn the collar to the right until it locks. The collar will automatically force the blade end into the right position to lock.