yes, a tripod is necessary.
cable release, not so much. helpful and convenient? yes. very much so. necessary? no.
you can either use the timer, or even better, the mirror lock up. your camera should have this. this allows you to have the mirror move out of the way of the image sensor before the shutter opens. it also allows you to program in a specific amount of time to wait before opening the shutter to allow any small vibrations from the mirror moving to dampen out.
of course, that is assuming landscape photography. if you photographing anything moving, you'll need light, and the easiest and most portable form of that is a flash.
a faster lens and higher ISOs will help out as well by allowing the same amount of light to reach the sensor in a shorter period of time. faster sutter speed, less blurring.
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