Well, sure. I've had those too. The trick is making sure some of that time is spent validating the assumptions you made explicitly or subconsciously. Doing the

Well, sure. I've had those too. The trick is making sure some of that time is spent validating the assumptions you made explicitly or subconsciously. Doing the change right means making sure that a) your change actually meets the request as the requestor understands it and b) doesn't break other features that already exist.