[rangibaby]

Learn how to draw or sculpt or both? The main hurdle to starting Blender is it's odd interface, but it's possible to get comfortable in it in anything from a week to a month depending on how quick of a learner you are. The rest is up to your artistic ability.

[ffwacom]

+1 on the learn to draw/sculpt for non-obvious. A (skilled) 2d artist with no 3d experience will run rings around any beginning/intermediate 3d artist.