Once you have a dozen or more new fronds, you can prune the ugly fronds off any time of year you like. If you kept it tightly trimmed with only 10 or 12 fronds over the next 5 years and longer, the new trunk diameter would be a little smaller. You could actually cut every frond on the tree off every 2 or 3 years and not hurt a thing.
It isn't rocket science, and the less experienced the guy is cutting the frond, seems the more frond they leave. If using lopers or hand saw, you can't mess up really. As long as you cut only the fronds you want removed. I prefer to cut below the last thorn.
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