Mick, you might also be interested in this previous Workshop discussion - https://www.workshop.com.au/t5/Outdoor-Living/Wine-Barrels/m-p/11656
Do you have a circular saw?
You could also use a handsaw, as per this - https://www.doityourself.com/stry/how-to-cut-a-wine-barrel-in-half
Great idea @Maddogmick54 - they come up great and are easily done.
I've done a few and have found it easy enough with a Jigsaw or Circular Saw.
Make sure you line it with black plastic to help preserve the wood a bit and a few drainage holes are a good idea.
Keen to see how it turns out!