Give the next person enough notice to choose freely rather than rescue you reluctantly.

Notice is what turns a request into a choice. Ask three weeks out and someone can weigh it honestly, decline without drama, or agree and mean it. Ask the night before and they can only refuse and feel bad or accept and resent it, because the situation has already made most of the decision. Late requests are rarely intended as pressure and work as pressure anyway.

Look at what you will need from other people over the next month and ask now. Early asking is one of the cheapest kindnesses available to you.