No, it isn't very n00b friendly, most people around here have solid working setups and have forgotten about the work they put in to get them to work. I spent at least 50 hours working on Freespace SCP before I figured everything out, but I treated it as an enjoyable hobby.
As far as the new nebulae, it depends on what you're talking about. there are several sets of nebulae. Theres the retail set, the sets that were used with the old campaign mods, the New Freespace2 set, and the Lightspeed Ultra High Quality Set. You're probably talking about the fact that the nebulae in Inferno are old and don't look very good. First, make sure that you are linking to the mediavps in your Inferno mod.ini and that you have the mediavps in a seperate folder. this way, when you select the inferno mod, you also load the mediavps as well as the Infernovps. To run Inferno R1 in the best quality mode for the SCP you also need to have Inferno R1, The SCP Patch for R1, and Shadows SCP Overhaul patch, which is in the thread "Updating R1" in the Inferno forum. Shadow's patch is what gives you the improved nebulas, if i'm not mistaken.
If you follow all the instructions you can get Inferno R1 working with with the SCPs and all updated graphics and many fixed bugs. It's a really fun campaign to play but it is short. Keep in mind Inferno R2, which isn't released yet, is a rewrite of the entire campaign. (Like an alternate history).