2004 Grand Prix Tranny Replacement

[Charles20212]

so heres my story guys my car was having tramission shift problems. In the drive the car would take awhile to shift past 20-25 mph it would move very slow until it reaches the speed. Then i figured out my car drives fine when in 2 and 3 gear, so after about a week driving on the gears the car doesnt move at all now forward. So my guess is its time to replace the tranny but i havent done a job this big yet and i was wondering if you guys had any writes ups or DIY guides