The hardest part of changing how a firm works is rarely the new system. It is leaving the old one. Years of client files, organized in a way only your team fully understands, feel risky to move.
Name the real fear
The worry is not really about software. It is about losing history: the document from three years ago that settles a question today, the trail that shows what was filed and when. Any move that puts that history at risk is not worth making.
What a safe move protects
A move worth doing preserves two things. First, the documents themselves, complete and unaltered. Second, the context around them: which client, which year, which job. A pile of files with no context is not your history, it is just storage.
Keep the firm running while you move
You cannot stop serving clients to change systems. The transfer should run in the background while your team keeps working, so there is never a day when the firm is between systems and unable to find anything.
When the move is done well, the old system stops being a thing you maintain and becomes a thing you no longer think about.