I always say DeviceNet is a lot like swimming; if you don't know the basics, you're in trouble. But the basics are easy to learn.
Use a decent 24VDC power supply. Ground the negative side. During commissioning, make sure you have a toggle breaker or other way to switch the DNet power off and on.
Install two 120 ohm terminating resistors at the ends of the trunkline. Put a label over whatever cover you put over them indicating where they are. Use an ohmmeter to verify there are two and only two connected (you will measure 60 ohms between blue and white with the power off).
There's a nice tutorial powerpoint slideshow that installs with RSNetworx for DeviceNet. You can learn the basics of upload/download/configuration with the software from that slideshow.
EDS files can intimidate the novice, but are not very difficult to manage. A CD full of them comes with your MCC, A-B posts them all on their website, and you can upload/create them with RSNetworx for most devices.
The new DeviceNet Tag Generator Utility takes a lot of the drudgery out of integrating RSNetworx and RSLogix 5000. Make sure you have RSNetworx v7 or v8 and it's included.
I am a big fan of the features that DeviceNet gets you. Digital speed reference and feedback from drives. A large handful of monitoring parameters from overload relays. A big reduction in wiring complexity.
Do some good labelling so you know which node you're looking at when you open the MCC bucket. Print out a list of the 1756-DNB status codes so you'll have them close at hand. Buy a very good terminal block screwdriver. Invest in some shrinkwrap tubing.