Keep in mind that flying a DJI drone in P mode is ridiculously simple, because the software is doing all of the difficult things for you: like maintaining height and position. Make sure to practice in atti mode, or even better: with a cheapo drone, in case you ever need to correct the drone if GPS mode stops working. Trying to learn it while panicking as the drone does whatever it wants is a pretty steep learning curve that you don't want to have to deal with.
Good job and have fun flying