Mazda 3 Transmission Replace/Remove

So I Can't Start My Vehicle Listed Above Originally Had Code P01260 Decided To Use Forscan To Get A Better Reading And During This Time...

I Have The Car Listed Above With An Automatic Transmission. I’m Trying To Figure Out How To Replace The Transmission.

When Shifting To Drive, The Indicator Shows Rapid Change From 1,2,3, But Not Moving And When It Reaches 4 The Transmission Works But Hard To...