It worked for me! I run grapheneOS, and I do not use the fingerprint scanner, but the phone looks to be working completely fine now. I just had a lot of trouble turning it off at first.

What I'll also say that this took me about 3 hours in total. The time-consuming parts were the iOpener heating, the screen being carefully pried off, and plugging it back in. Otherwise, it wasn't too difficult or lengthy.
What I'll say is that the basic clamp didn't really help me with a smashed screen, but it worked out in the end with some wedging. Careful not to damage the battery if you do that!!! Oh, and, read all the comments next to steps, and all the guides in advance. It might save you a lot of trouble.

This guide worked well for me. The only difficult part was that the adhesive doesn't really want to go, and reattaching the screen connector was quite time consuming.

When this happened to me, I went back and put the display cable in again. It wasn't done properly. I'm sure you got it fixed by now, but you should not forget the metal bracket too.

You just kind of squeeze it together, really. Don't crush it, but press it together pretty tight. It's adhesive, after all. It likes pressure. I didn't really feel any sort of clicks when I was done. On the main page, there's a link and lots of comments regarding the fingerprint scanner.

Take your time. This is hands down the most difficult portion of the process. There's a very slight click when the cable is assembled again. Barely audible, if at all, but you can feel it under your finger. You can unfurl the cable a little to make the process easier, because it will try to bend back into it's folded position otherwise.

There is another pull tab at the bottom. Do NOT pull it off. You are only pulling the main, inside liner. Step 10 has the final removal.
In fact, I think this could be specified in the guide.

They are not kidding, it is really sticky. The way I did it was to slot the top left end in first, top-right end after, and then just kinda let it fall into place. The edges aren't sticky, so you can hold it from there. Carefully.

I removed some of the clumps using the tweezers as suggested by other people, given the adhesive is REALLY resistant. I didn't want to take the risk of spilling alcohol or something like that inside. The fit didn't seem to be affected by the new adhesive, which seemed a lot thinner than what was previously there. I wager that my phone will be much less water-resistant now.

The tip from danielle worked, but I got a little spark from the metal tweezers! I hope that didn't damage anything too badly. Maybe use a toothpick or something like that to push the metal bit in.

If your screen is broken, the suggestion of using tape is not a bad one at all. I did end up pulling glass shards off the old screen too.