Welcome !
Here's my standard advice to any new P3 Pilot:
With regard to the horror stories you may have read or heard I recommend that you check your FW version which will probably be 1.1.8 on the P3A air-frame and 1.1.2 on your controller.
DO NOT update the firmware on either !!!
You will see the DJI Pilot App telling you you need to update but that is an auto push message and just ignore it.
Download and RTFM. No, not the best written but there is some good content.
With Props OFF: Charge your flight batteries and controller. Perform a compass calibration. Perform an IMU calibration. Perform a gimbal calibration. All easy to do and it will force you to navigate around the app.
Next spend 30-60 minutes just browsing the app with the P3P turned on and the app on.
Learn where basic functions are located. Set your RTH parameters, etc.
I ran two flight batteries down to 50% doing just this the week before I maidened my P3P.
If you have not flown a multirotor or any RC aircraft before just take it easy for the first flights.
Concentrate on flying the P3 in front of you at all times. Do some slow 360 turns next. Practice landing manually after that. Ideally, find a co-pilot to help guide you through the first flights.
If you're an experienced flyer you'll have a blast almost immediately. The stability of the video image is astounding and the range of the P3 is fantastic.
:harry