Hi - I personally think you should be. Over the past years, I have heard and seen people cramming and using learning aids / brain dumps just to get certifications. I have been on courses with people that have got the CISSP and I discuss topics and they look at me and actually don't know some of it. I myself do not have it yet but will be sitting the exam in the next few months. Along with working in the industry for 7 years, I have both Edition 3 and 4, have study aids and practice all domains in my working week. I think its essential. 🙂
I think that being able to understand the content is important. Being able to Parrott fashion repeat for the Exam would lead to shortcomings in your knowledge in the future.
Don't forget, that if you don't have the pre-requisite experience to complete the endorsement for your accreditation you can apply for the Associate Designation while you gain the experience.