How do I change the control solenoid on the.

How do I change the control solenoid on the transmission can u send me a diagram or know where I can get one what is happening is that it will shift a little hard some times and also has a little winding noise to it but the fluid is not burnt and it does not shift hard all the time if I go somewhere and it does it but when I get back in to leave it is like the computer reset its self and how do I know which one would be bad