#How do I take the output of sample

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static urchin
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Your thinking is a little wrong - you always need to apply calculations to the uv coordinates before sampling. It's those coordinates which tell you which pixel of the texture is used.
If you want to add some wobble, you'd likely use some Gradient Noise, or a Sine, multiplied by a small amount like 0.01. That is used as an additional offset (can use another Tiling And Offset, an Add node, or if you already have a Vector2 node to only scroll on the horizontal axis, use the Y port to make it only wobble on the vertical axis)
For example one of these, if I'm understanding what you mean by wobble correctly.

image.png
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Can also make that wobble more dynamic by adding those two methods, or multiple layers of noise scrolling in different directions/amounts.