I used to use a pair of needle nose pliers to accomplish the squishing of the staples but that can be dangerous too. One slip and you can gouge the coin.
Now, I use a Flat Clinch Stapler
(http://www.brent-krueger.com/stapler.html)
It flattens the staples as you staple. Neat little item that has probably saved me from carpal tunnel syndrome as well as from scratched coins.
Also remember to not staple the holder too close to the coin. That is another thing that can lead to a damaged coin if you happen to slip...and if it is a coin you like, the odds of slipping are much higher.
--------------------

|| The Stujoe Collection || Digital Photo People || Stujoe.com || NumisLinks || NumisWiki ||