Some different thoughts and ideas on newaza for self defence.
My own priority is always to get up and escape, but in certain situations or for certain professions, that may not be possible.
https://www.youtube.com/watch?v=wCj0IfpFjqY
https://www.youtube.com/watch?v=CusoFfBmTWU
https://www.youtube.com/watch?v=SjJOmj90Knw
https://www.youtube.com/watch?v=xeX1PyKKuYk
https://www.youtube.com/watch?v=U96M9aJCsmo

 http://ecx.images-amazon.com/images/I/513Y5356CEL._SX321_BO1,204,203,200_.jpg

 Groundwork, and perhaps especially escaping from a dominant/strong top control/pin, is something that takes a lot of practice however- and like anything in life, is not guaranteed!