I took and passed the sec+ yesterday.
Resources I used were CBTNuggets as the primary study guide-these are the best-he goes through each of the objectives point by point. And you can speed up the videos if you don't have a lot of time.
Also squeezed in some professor messer, those free youtube videos. Sometimes he expands a particular objective point you're lacking on. And then used this book from amazon, but I'm sure any would do-I just liked to have a physical copy of something to flip through.
I didn't find it too difficult-I definitely had to focus and think, but I was confident at the end that I had passed.
I did Security+ in a month. I used the McGraw-Hill All-In-One book (http://www.amazon.com/CompTIA-Security-Guide-Fourth-SY0-401/dp/0071841245/ref=sr_1_2?s=books&ie=UTF8&qid=1460728607&sr=1-2&keywords=security%2B) and Professor Messor's study notes.