I have the PM brief the approach himself and set up all the radios, courses, and sequences. Then, when (s)he's done, I hand over the controls (don't forget to brief the state of the A/C [A/P settings, hdg, alt, new instructions etc.] before handing over and re-accepting). After that I call present position and general approach entry (vectors/PT). Then I review and brief with W-SHAFTM.
W eather: Confirm approach is legal, and hazards, winds, etc.
S peeds and Shouts: Ref and any approach climb requirements. Call outs I'd like along the way (2m FAF, 1M FAF, FAF, MDA, MAP)
H eading: final approach, missed initial
A ltitudes: top of hill (intercept or FAF), bottom of hill (DA or MDA), missed altitude.
F reqs and flaps: (confirm all NAVs and COMs are set and tested) (confirm flaps straight in or circle)
T ime: (FAF to MAP) (and VS for a constant descent)
M: issed (default plan to go missed, and if the approach goes well enough, you might be able to land out of it).
Don't forget to brief generally (style issues, hot buttons, callouts, etc,) before the flight and during enroute. If captain, let your FO know what you expect and desire. If FO, inquire of your captain. It's been my experience that most problems happen when communication breaks down and the two pilots don't know each other's expectations.