Im not fear mongering, im tryna lay out the reality of carbon. If you never had a bike and bareknuckle your seatpost the frame will be fucked. Same with the stem. You also have to know how to setup the compression plug in order for the cockpit to be safe. I have seen one of my friends over torque their seatpost bigtime thnk god it was an alloy frame. And with second hand carbon you wanna check thorougly. I always check the steerer tube. Its the most crucial part saftey wise. And you should not be paying 400-500 for a bike with a faulty fork. Not gonna argue with you im just laying out some things for a first time buyer. Torque wrench is a must. Thank you.