A writer is obviously at his most natural and relaxed when he writes in the first person. Writing is a personal transaction between two people, conducted on paper, and the transaction will go well to the extent that it retains its humanity.
William ZinsserMany of us were taught that no sentence should begin with "but." If that's what you learned, unlearn it - there's no stronger word at the start. It announces a total contrast with what has gone before, and the reader is thereby primed for the change.
William ZinsserWriting is hard work. A clear sentence is no accident. Very few sentences come out right the first time, or even the third time. Remember this in moments of despair. If you find that writing is hard, it's because it is hard. It's one of the hardest things that people do
William Zinsser