Check out this video from English Heritage demonstrating the multiple stages necessary to fire a Brown Bess musket.

The Brown Bess musket was the weapon of choice for riflemen during the rise of the British Empire and was used in numerous incarnations for over a hundred years. The musket, which is a .75 caliber flintlock, weighs over 10 pounds and is almost a meter and a half in length. Due to the many stages required to fire, as well as its unwieldily proportions in comparison to modern firearms, firing the musket was a tricky task, with experienced shooters capable of only four shots per minute.