It took me 4 hours, much of that was slowness at the beginning and meticulous removal of the old adhesive for the screen. The actual screen removal was so much easier than I was afraid of. I followed along with both their text & video guides and it was all pretty straightforward if a little nerve wracking and time consuming. Very happy with it! If anyone has any questions about the process lmk
I used a regular hairdryer (with one of the heads that focuses the airflow) on the medium setting. The rest of the tools I just used what came with the new case-- it comes with a big locking suction cup and some thin plastic cards (think credit cards but thinner) for sliding under the edge of the screen to separate the adhesive.