Usually we let external accountability and sometimes importance determine when during the day we should do a task. If you have some freedom why not try prioritizing with ease? The question you ask here is ‘when is this the easiest to do?’. Sometimes I procrastinate my meditation but when I ask myself ‘when is easiest time to do my meditation?’ it is usually easiest before I have read other things, talked to others or have started working? Why? Because these are all things that could potentially distract me from meditation. By doing it before I have less distractions to deal with. And that is a pretty effective argument when it comes to procrastinating.