Unfortunately I'm in the same boat as you. My daughter's s3 just took a 6inch fall onto tile and spiderwebed the screen.
If the touch screen still works you can change the glass alone. I'll be ordering the new screen tomorrow and replacement it myself. I may do a how to video but really there are a bunch out there already.
Only my 5th screen replacement, 2nd on the s3 but the first one on my daughter's. Still get nervous every one I do...
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