"if one is trying to duplicate "jurassic park" shots, it's not a one-man job" It could be done by one man, if that man has the time, knowledge, and tools to make it happen. Of course, don't expect one man to make an entire movie like this, but one or two shots can absolutely be possible. Highend apps like Maya, 3dsmax, XSI, etc. have what are known as compositing or matte materials. This allows you to "block" certain elements from being rendered, while still allowing them to receive/cast shadows, or to occlude other objects in the scene against a background plate. Combining this with good camera matching is key! For example, if you have a tree in your background plate, you can occlude the 3D dinosaur as he walks in front of it, making it APPEAR to the viewer that he's actually walking BEHIND it. Sounds strange, but it's cool and works well. As for lighting, IBL is the way to go for accurate results, but ONLY if you bake it as a lightmap or fake it with a lightdome. Forget about true GI/HDRI unless the shot is very brief, or you have access to a powerful renderfarm. Finally, the most useful thing you can do for matching reality with 3D is to render your 3D shot out as multiple passes. This way, when you composite them together in post, you can adjust the color, lighting, shadows, specular, etc. all seperately, and with greater ease.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.