Like everyone else said, start small. I've made the mistake of jumping all in to something just because I was excited, and then when the newness of the activity went away I got burnt out.

So I started waaay smaller. For example, I read about 6 pages a day of my security + study guide book, and I've kept at it for over a month now. This is largely because, for me and my life circumstances, 6 pages a day is far more achievable than 40 (avg. chapter size).