First off, it’ll be pretty difficult to get the right replacement parts. Even if you get them, being inexperienced, you’re very likely to end up breaking and/or cracking the new windshield as well. Besides that, getting the right amount of pressure to ensure a good seal is no easy task—to say nothing of the tools and equipment you’d have to buy.
Best of all, drivers who use Jerry save an average of $800+ on their insurance—which should be more than enough to cover the cost of the replacement.