One time with the videos would probably have been ok, but I needed multiple times with the text. I am more of a audio/video guy. It takes me a few times to retain material I read. So I try to do a read one time through, then do the Pearson practice stuff, then repeat. The videos were supplemental material, so my focus was on Ciscopress.
The CCDA is a "swiss army knife" certification that requires you to have intermediate knowledge of r/s, voice, security, and datacenter. This cert is always better to be taken if you've finished your ccnp or have the relevant "real world" experience to draw from. Just having your ccna "without" any additional experience would be a bit of a handicap; it's best to be well rounded before taking that one due to the level of reference one is expected to have at time of testing.
Don't be in too much of a rush; it's best to have solid core r/s skills than have a multifaceted certification you can't properly support.