That all depends on what you call 'for noobs'.
I'm an avid user of SketchUp myself, but it's taken me some time getting there. All I can say is that I've had a good result printing my Hayden model almost straight from the 3Dwarehouse, with little modification. If you're just starting with 3D, tohugh, it's advisable you download a program that checks if your model is 'water-tight': making sure you completely sealed off the inside from the outside, and to make sure, for example, that you don't have illegal actions in your model (like two cubes touching eachother at one point; the printer doesn't understand that).
If you need help I can be of assistance. Just ask
Alas, you can always download the free version of SketchUp, download a model from the 3Dwarehouse and have a look at how the designer made the model. Be advised, though: not all models in the warehouse are of equal quality...