- Use Google Search Console and see what queries you get traffic from for the home page.
- Replace the old with the new text in one sweep.
- Monitor and see what you've gain and what you've lost as far as organic traffic for the home page and see if you are missing anything. You can roll back if the "damage" is extensive. There is no real damage you can end up with that you can't reverse. You can always roll back if needed - but if you say the content is on the same subject but more professional then all should be good and for the best.
Hope it helps.
