Ability to edit text or add a custom message when checking out

We have had a few clients get to the final page of our order page, and they feel like they are going to be forced to pay if they click submit order. We have it set up that they will not be forced to pay until the services have been delivered. It would be nice if we could add a custom message, edit/remove the You Pay text or even edit the text on the Submit Order button to help alleviate this issue. It's caused multiple clients to abandon an order and go with a competitor.