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Move your TV until it is safe on the ground. Clear off a flat spot for it and lay down a clean, soft tablecloth or bedsheet. It would be a shame to get this far only to scratch up the screen. You've managed to dismount and protect your TV so far, but part of the mount remains attached to it. Fortunately, this part is way easier than getting the TV down. No matter the shape of the mount piece, it'll be attached by four screws. Without the TV, the other mount piece is an empty frame on your wall. If you choose to remove it, undo it the same way you did the rest of the mount. These screws shouldn't provide much resistance, so undo them and slip the mount piece off the wall.
Place the TV face-down. Unscrew the mount piece on the TV. Unscrew the mount piece on the wall.