The guide was pretty good but a few comments:

I didn’t liked the iOpener that much. I used an heat gun with good temperature control instead.

Any advice on how to remove the old glue residu would have been welcome. I used a combination of physical scraping and cleaning afterward with isopropyl alcohol.

An extra guide on how to apply the new adhesive strips would also be nice.

Agreed with John Maier. Heating softens the adhesive.

If the adhesive is not useable anymore (because a broken screen leaves very small glass pieces) use the thinnest double sided tape you can find.