(but you should remember they are easy to counter)
The main difference is that o-goshi is much more 'deeper'
A) We take a little closer to the opponent than is required by a natural position.
B) Slide the right foot between his feet, and we take a step back left foot after a big curve.(this way we enter into close contact with your opponent's torso with the torso-should now be sideways to the opponent)
C) shove your opponent's hips buttocks in the back and we raise it up and forward (on a turnover right shoulder must be lower than the opponent's shoulders. It reminds me of the position in tango.)
O-goshi) Strikes up his hips by straightening your knees forceful
Uki-goshi) Pulling up sharply left and roll it through the hip.
E) The opponent falls to earth.