The youtube link is helpful - thank you! Frustrating that the guide doesn't go through the reverse steps more explicitly, especially considering the adhesives need to be relaid.

With these adhesives that come as part of the kit, make sure to keep the blue coverings face-up, then press all over before attempting to pull the blue coverings. This is especially fiddly when laying the final adhesive for the screen. Whilst pulling off the blue covering here, I went especially slowly and followed with the spudger to keep the adhesive down if it was coming up with the blue covering. Note: it's worth placing the adhesive before cliping in the screen connector unless you want to test the screen first (as per the youtube vid)

Using the repair part tray to hold stuff that's needed later worked well for me

Snapped on me too. Worth saying that

1. It's not worth going all out for a "Shallow" angle if the tape will get caught on any other fixings on the phone. Keep it shallow within reason
2. Take your time! Pull slowly - when you've pulled a little bit, hold and regrab the tape closer to the battery with your other hand and pull slowly again. Keep doing this rather than doing one long continuous pull

Don't have a microwave, so I boiled the kettle, left the iOpener in for 5 minutes and it was a good temperature to go. Doesn't need to be that hot to be effective