As others have said, I don’t recommend trying to do just the glass. I worked in a repair shop for 2 years and we always used full assemblies because in the long run, it’s more cost effective. From my understanding, you have to have very specialized equipment and it takes some skill. If I’m being honest, it’s likely you would damage the LCD panel trying to separate the old glass from it. It doesn’t take much to damage an LCD. This would make it useless and then you would have to purchase an entire assembly at that point. As I’ve never done it before, I can’t say for sure, but I think gluing the new glass on can be quite tricky. I would compare it to putting on a screen protector but with much more permanent results.
TLDR, just spend the money to get a full assembly and call it good.