The middle of any change looks like a mess. That’s not failure, that’s construction.

Disorder in the middle of a change is the change, not evidence that it went wrong. The old arrangement has been taken apart and the new one is not load bearing yet, so for a while you have neither, and that gap feels exactly like failing. Plenty of good changes get abandoned at this stage in favour of the thing that was at least tidy.

Expect the messy stretch and name it while you are in it. Carry less of everything else while it lasts. Judge the change once the new structure stands, not while it is going up.