I prefer Lightroom 4. I have also noticed that image processing seems to work much better from RAW than JPEG, so that's why I started shooting it. I just wish it didn't take up so much storage space.
I'm no Lightroom expert yet, but I did get a pretty good idea about how to do some things by watching a few free videos. I just googled "Lightroom 4 Tutorials" and got tons of results. Videos from Adobe were helpful in figuring out how to organize and manage images with Lightroom and some videos from a guy named Serge Ramelli were helpful in showing me some of the possibilities for editing images. I'm sure there are tons of other resources out there, but those were the ones I used.
Nikon D5100 AF-S DX NIKKOR 18-300mm f/3.5-5.6G ED VR AF-S DX NIKKOR 10-24mm f/3.5-4.5G ED AF-S NIKKOR 50mm f/1.8G SB-700 AF Speedlight