IF you want to do the whole ball EVENLY and PROPERLY, there is only one way: with a spinner and water. Sorry.
By hand, if you want a relatively minor change in the surface, lay the fresh pad on your stronger hand, place the ball on it, and with the ball always resting on top of the pad, spin the ball slowly with the other hand. Rotate the ball in different directions, so that the entire surface of the ball is eventually spun several times on the pad. Gravity and the weight of the ball governs how changed the surface will be (as well, of course, as the starting surface of the ball.) This process pales significantly to using a spinner with PRACTICE. The results will NEVER be the same nor as good as a spinner. (been there, done that, before buying the spinner; felt very silly thereafter, even having attempted to do it without a spinner.)
You can also place the ball on a holding cup and with a hand sprtizer, spray water, while rubbing with the green pad, CONSTANTLY spraying both the pad and the ball with water.
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"None are so blind as those who will not see."