I'm just a spring chicken at 66, but here are my suggestions that should help you fly the Phantom into your '90's. I'm assuming you've gone through the calibration with the software. You should also program the right toggle switch (S1), second ATT position (closest to you) to allow you to switch to the Return to Home mode. That way, if you do something wrong, you can instantly flick that switch and the craft will return to home on its own (assuming there are no trees or buildings in the way).
1. Start by making sure that the IOC switch (S2) is in the OFF position, the Control Mode Switch is in the GPS position, the right toggle is centred, and the left toggle is in the down (closest to you position).
2. Always turn the transmitter on first, then connect the battery to the Phantom. You'll get a flashing yellow light if you don't do this.
3. Wait for the flashing yellow warm up sequence to finish.
4. Rapidly switch the Control Mode Switch (right one) between GPS and ATT mode about 10 times until the yellow light is solid on. End in the GPS position.
5. Calibrate your compass by turning the craft as is shown in the diagrams and the light starts flashing again.
6. Put the Phantom down on the ground pointing in one of the main compass directions (N,S,E,W), and wait until it has a solid GPS position (all green flashing lights). THIS IS MOST IMPORTANT; I don't fly my Phantom until I have this. Clouds don't affect GPS signal acquisition, but tall buildings, thick trees, narrow valleys, and being indoors certainly does.
6. When you fly the Phantom, make sure you never lose sight of it! DON'T fly it too high, DON'T fly it directly overhead, and, until you get experience, DON'T fly it from in front of you to behind you where you have to turn 180° to keep watching it.
7. Before you let the Phantom fly more than about 50 feet from you, test your controls on the transmitter to make sure they are doing exactly as you expect. When you want it to go right, it goes right; when you want it to go away from you, it goes away, etc.