There are DIY methods for replacing a drive belt in a car, but it's important to note that it can be a challenging and potentially dangerous task. To replace a drive belt, the serpentine belt must be removed, which requires specialized tools. The cost of the drive belt is relatively inexpensive, ranging from $20 to $100 depending on the make and model of the car. However, it's recommended to have a professional mechanic replace the drive belt to ensure the job is done correctly and safely.