Actually to get to 0.1 c you only need to accelerate at one gee for around six months; it might be a little less - I can't find the exact figures at the moment.
If you can build a motor which can accelerate at 1 gee for an hour you would be doing quite well; accelerating for six months solid would be a remarkable acheivement. Imagine how much fuel and propellant that would require.
One way that such prolonged feats of acceleration might be to remove the fuel from the spacecraft, and propel it by beamed energy of some sort; high powered lasers, or even better, tiny particles of mass (a particle beam) would work to transfer momentum to a suitably lightweight vessel.
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