There's nothing to talk through, you just fill in the most basic of personal details, send back your old passport, and upload a photo. Oh and part with £75.50.
Even if you do need to go to a photo booth, rather than take a photo at home, you get a code now on the print which you send instead, no posting of a hard copy photo.
I've just done mine, had one self taken photo rejected and had to send another, but the whole thing took less than two weeks, and this is supposed to be the busiest time of year.