That calendar on your computer and phone can do wonders in your life.

Note down your appointments, reminders and other works you have to attend in the calendar you have     on your computer, laptop, phone or tab. Since you may not be using the same machine every time, load your schedules on a calendar in internet ( say Google calendar). To choose the right calendar look for one that will synchronizes with  your task managers, desk diary etc and will allow to set alarm in different lones for different occasions, to set reminder over reminders, etc.