I'm having to manually download all google apps. You are right, this guide is shit. I wish I'd known that going into it. I still can't get magisk (at the 6 minute point of the video) installed as there is no explanation on how to do this and every method I've tried doesn't even see it on my phone. I'm not even sure what the hell it does so I've just moved on and skipped everything after it. Its not perfect, but I guess its better than what it could have been.
Give this was my first time trying it and I didn't manage to brick the phone you should be fine.