You would be able to get that smooth, you leave it for 20/30 minutes so it firms up a bit, splash some water on it and use the float to smooth it, repeat this 2/3 times and it will be smooth.
Each time you use the float you will pick up some plaster on it which you can use to fill any low spots
This looks predictably shit, but, first go. Have sander, will fill.
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