umm ... it depends. It is difficult because you have so many tools and objects (splines, nurbs, cameras, lights), too many layers of colour and texture (diffuse, specular, luminous, reflective, alpha), too many parameters to consider (shadows, radiosity, caustics, illumination, fall-off, reflection, refraction) and too many render options to play around with.
The biggest hurdle for me is the cost of these softwares and plugins + time it takes to render stuff (an interior shot can take upto an hour with medium settings)
Having said that, there should be no reason why you shouldn't be able achieve all this if you have the desire and motivation to learn! all the best!