Ultimately, it will come down to your level of discipline and self control. Since you are "master" of your Macbook, you will have the power to get around any controls you put in place, so those controls are only illusory.
If you are truly intent on fixing the issue, you will fix it without any "add on" controls, and if you are not truly intent on fixing the issue, no amount of "add on" controls will ultimately help in the end. They may serve as "reminders" for a short while, but eventually the reminder impression will fade and you will be back where you are now.
Ultimately, it will come down to your level of discipline and self control. Since you are "master" of your Macbook, you will have the power to get around any controls you put in place, so those controls are only illusory.
If you are truly intent on fixing the issue, you will fix it without any "add on" controls, and if you are not truly intent on fixing the issue, no amount of "add on" controls will ultimately help in the end. They may serve as "reminders" for a short while, but eventually the reminder impression will fade and you will be back where you are now.