@Terrificli -- shopping for mushrooms is the safest route, but there are some hobbyists who enjoy the heck out of spotting them in the wild. How can one avoid being poisoned? Research, learn from experts and cultivate enough knowledge as you can about how to spot safe mushrooms. Remember -- people who are probably no more intelligent than you developed ways to harvest safe mushrooms centuries ago. You can develop those same skills.
Still, even a hobbyist skilled at spotting mushrooms should learn to leave something alone if there is any doubt about whether it is poison or not. There's nothing wrong with cultivating mushroom hunting and collecting as a hobby, but exercise some caution in the process.