If you are installing night sights, percussion will get the old sight out, but may very well break the tritium glass vial in the new sights going in.
I know you're in Baton Rouge but, we only charge $25 to change sights on a Glock. Perhaps there's a forum sponsor your way who can do it for you...
We are an authorized dealer for Fort Scott Munitions
We currently have a wide selection of calibers and weights available.
If you're not familiar with this ammo, check out some U Tube videos.
http://www.youtube.com/watch?v=HKa2DNV_ol4
http://www.youtube.com/watch?v=QZdFeu7k6Sw
The Shockwave Firearm is $396.99
The Mini Shell Slugs are $26.99/Box of 20
The Mini Shell 7 1/2 shot are $17.99/Box of 20
The OPSol Mini Clip for Mossberg Firearms is $19.95
Home depot rents centrifugal water pumps. Connect a long section of 6" PVC pipe to a discharge hose, and stab up and down until you're a little deeper than you want to set your post. No concrete required. Nature will do the rest.