Why is it almost impossible to shift out of park when parked uphill- 2009 Buick

Hello, are you applying the parking brake before releasing the brake while in "park"? If the brake is holding the vehicle instead of the parking pawl inside the transmission, you will be able to shift the vehicle out of park with no problem. If the transmission and park pawl is bearing the entire weight of the vehicle -- then it will be difficult to shift to be sure.

⚠️ PARKING BRAKE ⚠️