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>>17868
Duplicate the symbols you want to edit in the library and rename them. This way you have the originals to go back to in case something goes wrong.
Get the "swap all" extension by CloudKid so you don't have to swap out symbols every key frame manually. This will make editing go from nearly impossible to manageable.
After you swap out the intended symbols the animation will likely look awful because parts are distorting in strange ways. At this point you sit down and go key frame by key frame cleaning things up one layer at a time. There is no work around. From frame 15 to frame 29, though, you can usually copy and past those frames until about frame 75 where everything slightly shifts vertically for some reason.
Most importantly, use "Save As" instead of "Save" because God help you if you don't like how something ended up looking and you don't have your previous step on backup. (Holy crap, Isabelle)
Lastly, make sure you are keeping an eye on what the instance name of the different symbols are so your script calls them correctly. The instance name can be checked by selecting a symbol and looking at the properties tab. New symbols don't have a name, and when you do name them the first character should be lowercase.
When i was first doing this and trying to make Shantae, my lack of understanding this brought the whole thing to a standstill.
Out of curiosity, who are you trying to make?