how to avoid unintentional score edits
When I take a score and try to add new features (eg, fingerings, tablature, new instrument, new voice, etc) to it, I invariably make unintended changes to the score.
If I notice these mistakes as they happen, they are easy to correct using undo. But if I don't notice these mistakes right away, they are tedious to discover and correct. I find that I very often don't notice such mistakes right away because I'm focused on the elements I am adding.
Are there features I can use to avoid modifying the existing score when adding to it? Any way to "lock" or "freeze" instruments or voices or staves, for example? Perhaps some manner of "append" mode vs "edit" mode?
I may be more clumsy than some, but surely I'm not the first to encounter this. I'm hoping this problem has already been solved and I just need pointing in the right direction.