We have all seen the look on someone’s face when they drop their iPhone and pick it up to discover the glass screen has been cracked. It happens all the time though, and fixing smashed iPhone screens is a huge business for third-party repair shops. In fact, there’s so much money in the practice of fixing iPhone screens that Apple wants a piece. Those with new iPhone 5s handsets that have already fallen victim to drops who are looking to save some money on repairs can opt to replace the shattered display themselves, however, and supply chain solutions company ETrade Supply recently posted a complete guide on its blog. The process really isn’t that complicated compared to other repairs, though the screen swap definitely shouldn’t be attempted by those without at least some experience. It should also be noted that opening your iPhone will void your warranty with Apple, but then again, so will bringing it to a third-party repair shop to have it fixed there.