Your answers arrive laid out like an attendance note, so the first meeting is about advice, not about explaining the basics.
Photo identification, and any deeds, policies or account details you have to hand. No values needed for anything.
Then a second short visit to sign, with two witnesses. Every complication you flagged here is dealt with in the room, not discovered later.
Ring the office and we will take the same details over the phone. The guide on making a will explains what happens at the meeting.