This [https://support.google.com/store/answer/7182296?hl=en-AU|link] may be of some help.
They should give you a quote for the repair if nothing else.
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=== Update (11/06/2018) ===
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Here’s a link to the ifixit [guide|102774] guide.
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Once you have removed the old screen you should be able to determine what else, if anything, needs to be replaced. It may depend on how well the new screen sits back in.