Always make sure to disconnect the battery before you do any work on the phone replacing any parts the digitizer or anything. And before you start make sure the phone is turned off you don’t want any power surges. If you also have a static electricity bracelet that also is a plus to use but isn’t a necessity just a nice piece of mind. Some cases you do need to use one so you don’t discharge static electricity to an electrical component and mess it up.
I have replaced sevrel screens for my sister in law and my niece. The packing tape has worked every time and that’s with it Shattered and pieces already falling out. You have to make sure the packing tape goes to the edge of the screen but doesn’t touch the frame. I have the plier like screen remover and use that it is much easier to remove the screen by your self with that tool. I also have the little finger suction cup that comes with the kit here. I bought the plier suction cup tool When I had to replace the screen that had the pieces of the screen missing and I don’t regret spending the extra money for that it has made a world of difference. I do this as a hobby it’s not a job for me. The electric divide repair kit from Lowe’s is also a very good kit to help. If you’re only going to do it once the kit that comes with the package is a great deal from ifixit. Well worth the money to spend the little extra to get the kit if you all ready don’t have the tools.