When you think it is all sorted think again. Did you achieve what you set out to achieve? Could it have been achieved better or earlier? Did the task need to be done at all? Did you need to be involved? Could you have planned it better? Questions that are often asked after the fact.
It is often better to be very clear on what will not be done so that you and others will have a clear understanding of what will be done. This way expectations can be clarified.
Ask and address all the questions before you start.