You can even use the Calendar here on the forums.
you can add your appts and such and set it to give you a reminder notice.
NT Calendar -
http://neurotalk.psychcentral.com/calendar.php
after you add the appt or event -then the next screen will ask you if you want a notice sent-
[Add Reminder: testing - appt
When to send reminder before event : {choices -1 hour to 3 days before}
Reminder emails can be slightly early or late. For example, a reminder scheduled for one hour before the event, will actually be sent between 1:15 and 45 minutes before the event. ]
I would allow plenty of extra time -at least a day to be sure I got it in time.