The right door seal and the freezer door seal are easily removed and replaced. They just pull out of the slot. These 2 new gaskets push in easily. The left door has the French Door Mullion, that blocks the removal of the door gasket.
There are two screws in the middle that holds it on, and there is a spring at the bottom of the mullion that keeps the mullion in place. The spring can easily be removed, or left in place. There is an electrical connector in the middle of the mullion. As suggested by "Gary160" on 10/07/2018, in a previous comment in a repair video, it helps to have another person hold the mullion when it is removed, and you will not need to disconnect the wiring connector. To remove the mullion, remove the two screws in the middle and raise it up to remove from the top and bottom hinges from the guide slots. The old gasket can now be removed, and the new one installed. To replace the mullion, you have to press towards the gasket to get both the top and bottom guide hinges to line up, and then slide down until the middle screw holes line up. Replace the 2 screws, and the spring if you removed it. (Easily removed and replaced with needle-nose pliers) You are done.