Hello, your beer will get better after conditioning, wheat beers are suppose to be consumed young, that being said, I have found with my wheat beers they become better (more mouth feel) waiting at least 3 weeks on the gas after kegging.
You and your friend need to take hydrometer reading before you pitch yeast and starting about 10 days after pitching to make sure the beer has finished the fermentation process, I take 3 readings, each about 2 days apart to make sure the gravity is not dropping, then bottle or keg.
Yes it sounds like your friend bottled to soon, or added to much priming sugar, both will over carb a beer.
Hope this helps
Edit: 2 other post went up while I was typing, I type way to slow I guess lol