Well magic mushrooms add a sense of complacency to the world around you. You tend to realize how the essence of you has affected the world. You'll realize how vacantly people can seem, along with how intelligent and complex the mind of a given person really is.
From personal experience, I had a moderately sprained ankle at the time I had 3.3grams. I felt at my absolute physical prime; my ankle felt nearly healed and I could swim longways across my pool twice (which I could never do before). It was the first time I truly felt like an adult with confidence in my health and social mind.
You'll almost certainly have a sublime trip. Bad trips are pretty rare, but they're avoidable and reversible for the most part as well. Just keep an excited and confident mindset and you'll be absolutely fine.
James Rex -- it is very difficult to become addicted to magic mushrooms. They don't cause drug-seeking behavior and nothing about them cause physical addiction and withdrawal.
In many peoples experiences, the psychedelic trip acquired from magic mushrooms seems more realistic than sobriety, which in essence is completely true. The brain processes just 200 out of 11,000,000 signals (0.000018%) it receives from the body at any given second. Psychedelics allow the brain to process thousands of more signals about your surroundings, emotions, and thoughts. Essentially you are experience hundreds of times the reality that you normally do.
Experience and over 26 months of research.