My experience of moving provider and fibre installation.
I have been a UPC/Virgin Media customer for over ten years and I'd been putting off switching for some time. I knew I could save money, but I also knew an install might be hassle. Last paying €72.50 to VM for 360 Broadband and Anytime World Phone (If you can call 'World' a mere 28 countries). Happened to have the Eir men on the doorstep back in April offering Eir Fibre Extreme 500Mb + Eir Broadband Talk on a 24-month contract for €39.98 and thought I'd sign up (yeah, I know).
It was made clear that it could go up by the usual inflation +x% usual after 12 months. It was also advised not to cancel the existing contract until I had the fibre up and running to avoid a gap in service.
I indicated that I wanted to transfer my existing home phone number, and that I would prefer to have the ONT (optical network terminal) placed where my existing Virgin cable line terminated as I have a few wired devices and I didn't want the hassle of doing a load of re-configuring of things.
This was the 27th April.