If you were the kid in Junior High who always put themselves in between the school yard bully and the fat kid with thick glasses, knowing that you were going to get punched instead of the fat kid, chances are, you would make a fine Guardian. If you get a nice warm gushy feeling inside when you are able to help someone who is having a trauma, chances are, you would make a fine Guardian. Guardians are born with the desire to protect and serve their Community and everything in it. Unfortunately, and contrary to popular belief, they are not born knowing HOW to best protect and serve their Community.
Experience often hurts.
If you're real lucky it only hurts you and not some innocent bystander. Of course formal training in areas like the Martial Arts, Emergency Medicine, Psychology, etc. help build a good Guardian, but it's all pretty useless without experience. Acquiring the skills and tools is relatively easy, what's tricky is learning when to apply which ability. If you have to answer any kind of a complaint about a festival campsite party, and you don't at least get offered a beer before you leave, you are doing something wrong. You need to spend as much time exercising your sense of humor as you do your muscles.