It's been said before and will be said again: Investing for retirement doesn't have to be hard. In fact, building a comfortable retirement nest egg can be more about what not to do than it is about what to do.

The last thing you want is to make a silly mistake or two to keep you from retiring early. The No. 1 thing not to do is put off investing for retirement, followed closely by not taking full advantage of your 401(k) or employer-sponsored plan.

If you're like most Americans, your primary retirement savings vehicle is provided by your employer via a 401(k) plan or something similar. If you have a 401(k), the key is to not only start early but to also get the full company match.

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Source Fool.com