Before you brief your instrument approach, WAIT!
W - obtain the Weather, typically from ATIS, and confirm that it is suitable for your approach.
A - perform your Approach Checklist
I - set up your Instruments for the approach, and load it into the FMS
T - now Talk about the approach
Confirm you are on the correct approach page.
Confirm the proper localizer frequency and approach course are entered into the FMS/navigation system.
Confirm the airport elevation and runway elevation.
Verify your flight path to the final approach course.
Confirm the glide path angle. A normal glide path is 3 degrees.
Confirm the minimum safe altitude and any obstructions.
Confirm the Outer Marker or Final Approach Fix crossing altitude.
Confirm the Decision Height or Minimum Descent Altitude.
Brief the Missed Approach.
Brief the runway exit plan.