In summary, you can avoid having to use your willpower by doing the following:

• choose 'want-to' goals (for which you have intrinsic motivations) rather than 'have-to' goals (for which you have extrinsic motivations)
• if you can't choose want-to goals, increase your want-to motivation for the thing you have to do
  find activities that promote your goals and which are enjoyable at the same time
• if you can't find enjoyable goal-promoting activities,
  • look for aspects within the activities you have to do which are immediately rewarding,
  • use temptation bundling (pairing an activity you have to do with an indulgence),
  • or decrease the value of indulgence with commitment contracts (agreeing to incur costs if you fail)
• be careful not to self-reward with indulgence and don't rely on temptation bundling and commitment contracts only