Most spudguns are capable of dealing a lethal amount of damage to a person. For this reason it is important that they are handled properly. Treat it like a real gun, and any time you are about to do something with one, ask yourself if you would be doing that with a firearm. The most important thing is use common sense
If you haven't had any firearm training you should read some of the links below to familiarize yourself with the guidelines.
related linksNRA Gun Safety Rules
The Fundamentals of Firearm Safety
Wikipedia gun safety page
Burnt Latke safety page
advancedspuds.com safety page