I don’t know what guide that is from, but it’s not my one from the docs.
You probably can just skip through most of it, but make sure that you have definitely done everything in each step. If you haven’t, redo the step in it’s entirety.
This should iron out any issues from using other guides.
If you do decide to redo it all from scratch, that whole guide should take about 40 minutes to an hour depending on your technical ability.