I was once going to reply in kind to a very nasty letter from the person who had expected to get the job I had just got. Somebody to whom I showed the letter and my reply said I should not lower myself to her level. Instead, I sent her a very courteous reply inviting her to discuss her plans with me and gave her a specialist role in the organisation. We continued to work together and when I resigned I made sure she got my job.
Somebody else told me that whenever I had a difficult job to do, phone call to make, etc. it was best to do it immediately and this has proved to be absolutely right.
I generally take any advice that my daughter gives me, because she is wise and thinks of all the consequences of any decision.