I think that in calligraphy, going wrong occasionally is inevitable. Sometimes the only way around it is to start again, although that might not be an option.
In fact the corrections can be a charming part of the work (not always, but sometimes!)
The magnificent St Johns Bible which was written by a team of Scribes working with Donald Jackson, by hand using traditional methods but modern interpretations. Missing a line out and realising several lines later cannot have been great. But the correction is beautiful and would never have been seen if it weren't for the mistake in the first place.
I'm Janet Smith, a calligrapher who loves to experiment with lettering and calligraphy.