Read the user manual over and over. Watch the instructional videos. Go through the checklist. Make sure everything has been charged before the flight. Compass and IMU calibrations are important. As Adreyzasran stated, fly alone so you can concentrate. Stay in an open area. ATTI manual mode is easier than you think, but it is very responsive. Even though I had no problem in GPS mode, others did. Just be mindful of fly-offs and other abnormalities in GPS mode. Even though you have flown a Phantom, spend some time in the Flight Sim, its worth the flight time. Go over the Pilot app video and get accustomed to where everything is located.