I disagree on #1. There's no need to be a martyr as a tech lead. Assign the tasks based on who is the best person to get it done (based on competency, knowledge of affected components, etc.). Treat your employees like adults. They don't need to be coddled, they know there are unpleasant tasks sometimes. Just try to be fair and ensure that your employees are not getting too such tasks to the point where they feel bogged down. Ask them "are you bored?" whenever you have a 1-on-1 meeting.