3D Modelling at my level takes patiance,
Basic are easy....
Things like complex chamfer and extrusion editing, modifiers, effects, UVW mapping, boolean editing (like cutting holes using other objects), and animation rigging...... will take quite some time to learn effectively.
It took me a a full year to properly master 3D studio Max and I am still learning new things now and then (after 8 years)
But the end result is satisfying:





Knowing UVWs and mapping will help you paint and mod other games too (using PSD,PNG,DDS XSI,BLANDER,3DSMAX for Source, ID-Tech, CryEngine etc. )
And for video and animation effects:
My Works:


and one from Psygnosis for comparison:

and what the Vostock SCUD in RCX was like during design and modelling:





I have been invited to take part in 4 other opensource games too, and one competition.