When I first started using the clipless pedals I would look ahead and anticipate upcoming stops such as stop signs, heavy traffic, etc and while approaching that "have to stop" area I would keeping telling myself over and over again in my head "I am attached, must clip out" and I would make sure to clip out well before I came to a complete stop that way I didn't just stop and tip over while still clipped in. For some reason just looking far ahead and telling myself "I am attached, must clip out" over and over again in my head really seemed to help me a great deal. Congrats on switching to clipless pedals, they really are great and help with climping and even on the flats as you can pull on the backstroke of your pedaling.