If you have a fibre-to-the-cabinet connection, you likely won’t need to have an engineer come to your home, as it uses the existing phone line. If you are in a new build without a phone line installed, you will need an engineer visit.
If you want full fibre broadband, however, you may need an engineer to come to your home to install a new modem. This is so the fibre optic cables can run straight from the broadband exchange to your household.