There are many different ways a combination lock can be built, the two most common are the "dial" and the "disk" construction. In both types rotating "tumblers" must become aligned so that an unblocked slot through the stack of tumblers allows the "bolt" to slide and unlock the mechanism.
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You can crack a 3-digit combination lock by sequentially trying every possible number. Writing down and keeping track of every number used will help avoid confusion and speed up results.
Start dialing. If it's a three digit lock, then you can try all the possibilities in a reasonably short time. If it's a four digit lock, then it will obviously take longer, but it's still something a diligent person can manage in an afternoon. (If you try a combination per second, which isn't that hard, you can exhaustively search out a four-digit combination in at most 3 hours.)
To reset the Cellini 3-digit suitcase lock, you typically need to locate the reset button, which is usually found near the dials. Press and hold the reset button while you set your desired combination on the dials. Release the reset button once you have set the new combination, and test the lock to ensure it opens with the new code.
528
There are 15180 combinations.