If you plan it right AT&T can enable everything without having to enter your home.
FTTN requires a dedicated pair connected to your NID, which I presume yours is accessible from the street. That pair needs to terminate to an RJ-11 jack and your new modem will connect to that. If you have a long enough cord, you can attach a twisted pair out the front of your house so the installer can verify on the modem side; or you can check right after installation while the technician is still there. They will first verify from the NID.
When I had FTTN, AT&T decided to connect my twisted pair (from a Cat6 cable) directly to the telco end instead of the customer demarcation device.
See the blue pair from the customer (right) side going to the telco (left) side at https://i.imgur.com/zHYtRDj.jpg
. The 3 customer demarcation devices at the right are unused for FTTN. The top and bottom ones were for legacy DSL filtering and POTS, respectively from Sonic; the middle was from an older installation.