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I would suggest that you buy one with the bezel as well. I've replaced my screen a few times.
I bought this from mustpoint. First one was defective but the second one is good. Easy returns with Amazon.
https://www.amazon.com/gp/product/B016MKV3QG/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
I honestly would not even try replacing ONLY the digitizer. I'd break it trying.
Here's the video I followed along. He uses a heat gun to detach the old screen from the frame and reglues on a new one. If you buy the one with the frame you can just skip that whole part.
Here's the part, looks like the price has dropped substantially on 2 weeks. Kind of pisses me off to be honest.
LCD Touch Screen Digitizer Assembly For Google NEXUS 7 2013 Asus ME571K Gen 2nd Frame WIFI version https://www.amazon.com/dp/B016MKV3QG/ref=cm_sw_r_cp_apa_a-QExbAQY2CBW
Don't be nervous, just make sure you have a tool to pop the back off. Honestly that was the hardest part for me. The rest was just screws. Little tiny screws. I think a thick guitar pick would work if you don't have anything else.