A lot of people ask me how I can remove all the nails (I don't cut the nails with a sawzall or any other tool) from over 50 boards in less than an hour. My secret is a tool called the air punch. While the tool may not be within the reach of anyone it is good to know that it exists. For those that can afford the tool it is important to know how to use it.
Use proper safety gear, you already know about gloves. I add mandatory eye protection, again you will see when that nail flies out that this can be dangerous even if you are careful.