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Interstellar travel is downright easy on time scales of hundred to thousands of years. We just need to make humans last long enough.

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[1]> According to wikipedia, interstellar travel at 1G would take approximately 1 year + the distance in lightyears. Proxima Centauri (4.2 light years) for example would take 5.2 years.

This^ is from the traveller's standpoint. I am not completely sure about how long it would take from the perspective of someone on Earth. But this definitely seems plausible if we can solve the other problems with constant acceleration such as sufficient fuel and protection from interstellar dust (at close to light speed, dust would hit with unimaginable force).

[1] https://space.stackexchange.com/questions/840/how-fast-will-...

Maintaining a 1G acceleration for years is either impossible or so hard it may as well be impossible. Even if you had a magic drive that could do it you would soon reach velocities where colliding with the smallest spec of dust would be like a small nuclear bomb. 1G to Proxima Centauri would reach a peak velocity of .95 c and hitting a 1g particle would release 48451 tons of TNT of energy. So you would need BOTH a magic drive and a magic shield.

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