I use this method:
Slow airspeed just above TL (usually around 40 knots, just before she starts to "shudder").
VSI zero
Ball centered
Crossing the area on a pre-determined heading
Then check:
Airspeed vs GS
Pitch setting vs power indicated
Track vs Heading
On the speeds, I can see exactly if I have estimated the winds at the area correctly.
Pitch setting vs power when VSI is zero shows me the same, plus I can read what my estimated power on landing will be (usually Power indicated pus 8-10 percent).
Track vs heading is all about the drift in case of wind again...
At unknown landing sites, I usually do a high recce, then a low recce including the power check, where I also check landing site elevation, last check for obstacles and approach path..