We had the same issue. I've deployed EV before and it was pretty easy. Now the Sales is telling us it's virtually impossible to install without professional services. We did get EV installed and it's working as expected. Doing it yourself is better since you know how it's configured, where things are, and know the strengths/weakness in the system. If you still are having problems, get Symantec pre-sales a call. What I did notice is that once the sales is complete, the support from Symantec is gone. They will force you to use their fee-based support team.
The guides are very important. Some of the information will not make sense and we did notice some minor errors in the documentation that we have forwarded it on to Symantec. BTW, if you are using EMC or NetApps, those storage vendors typically have great implementation guides that can help you out.
I do hope you all get a demo copy and play around with it before your purchase. At least you get a pre-sales engineer to help you out. Our old Sales Rep sold my team a product that was over promised and under delivered (specifically 7.5 features).
Overall, play with it and