I'm new to mountain biking, I just bought a used mountain bike, a 2007 MKlll Comp. I figure buying a new bike was a waste of money until I see if mountain biking is for me. I'm sure it is though. Been meaning to buy one for a while. It seems like a good bike. It was shipped to me in pieces. So, i put it together and all and it looks and feels like I put it together right. There is no problems that I can tell. But my question is should i bring it to a bike shop to make sure everything is all good?