I have a 97 f250hd with a 351w it's time to replace the oil pan. Does anyone have ideas on how to do it without removing the engine??

I am not sure why you need to replace the oil pan on your truck.
If for some reason you do though, you do not have to remove the motor in order to take off the oil pan. Read a haynes manual and refer to the instructions in that, but I really dont see why you would have to take out the motor.