If you're confident in your ability to repair a windshield yourself, there are kits you can purchase to do so. Many of them even include the same types of materials used by the professionals. However, not all kits are created equal, and the greatest advantage of using a professional for replacement is the expertise they bring to the table.
To the untrained eye, a cracked windshield that requires replacement may seem like a simple repair job. Driving with a windshield that was repaired when it really needed to be replaced is extremely unsafe and could lead to dangerous consequences.
If the DIY kit fails or the repair is unsuccessful, there's no going back - it has to be done right the first time. That's why it's always best to trust the job in the hands of a professional auto glass technician, like those at Speedy Auto Glass, who are experts at what they do. They have seen every crack and chip you can possibly imagine, and they know when a patch will suffice, and when it's time to get a new windshield.