Well said BOAC - useful technical gen, here's what the pilots do...
A summary of what happens on a normal A320 landing, assuming a servicable aircraft...
Autothrust (A/THR) engaged and active
Ground Spoilers ARMED
MED (medium) Autobrake selected.
The thrust levers (T/L) are in the CL detent, the A/THR can set N1 anywhere between IDLE and MAX CLIMB. Typical N1 about 54% for a stable approach. During the flare, PF retards both T/L to IDLE. No finesse required, just move them back to the mechanical stop. When both T/L are at IDLE the A/THR disconnects.
The Ground Spoilers extend automatically (see above posts for logic). This extension activates the Autobrake - two seconds after extension brake pressure is applied to decelerate the a/c at 3 m/sec/sec (MED).
On touchdown PF selects reverse - IDLE or MAX as required. Note that with autobrake functioning correctly reverse selection will not affect the deceleration rate or stopping distance. Reverse Idle is selected at 70 kts and FWD idle at normal taxi speed. Autobrake is normally disconnected by PF pressing the brake pedals at the appropriate point.
PNF monitors
1. Ground Spoiler extension on lower ECAM
2. REV Amber then Green indication on N1 gauge
3. A/c deceleration - by feel, IAS trend arrow, and Green DECEL light in Autobrake pushbutton (light indicates 80% of selected decel rate achieved).
PNF calls "Ground Spoilers, Reverse Green, Decel" as they are observed - (or calls a malfunction) .. then "70 kts".
TP