I've also found that stapling can be "interesting" in that sometimes those staple legs will turn and exit the wood frame at unwanted places. Be sure to keep your hands clear of any of those possible areas. Needle nose pliers and small vise-grips are handy to remove some of these errant staples. If you end up with a leg sticking out and removing it might damage the wood too much then grab the tip of the leg and bend it at a 90-degree angle to towards the wood....then hammer it into the wood. This way the point won't be sticking out to get your finger, hive tools, whatever...
Ed