Infinity 1 is self-install unless Openreach records indicate the line may have problems which necessitate an engineer-install.
Currently, Infinity 2 is engineer-install.
Not all Infinity 2 are engineer installs these days.
I just had an Infinity 2 self-install as an upgrade to regular BT Broadband. I dont have an OpenReach modem. Just a Hub 5 plugged via microfilter into a regular socket. See my experience here:
Yes - I saw that page before I ordered Infinity 2 - and that is why in my linked post I said I was expecting to have to book an engineer visit when I ordered online.
But the reality was I was not prompted - and I did not have to have an engineer visit.
I had a successful self-install of Infinity 2.
My whole experience is detailed in that original post that I linked to. But seeing as yous asked I get 75Mb Download and 14 MB upload with a wired connection to a Mac.