do i only slide it on the string, or do i press with the pick so it hits the frets?
Typically you don't hold the strings to the frets. Just lightly hold the pick near the top and scratch it from the strings at the middle of the body or so toward the neck
If you press it to the neck, it'll make the sound of you sliding down the neck with your fingers, along with the scratching noise.

I find it best to just turn your pick sideways, lightly lay it on the E, A, and D strings, and slide it down just on the strings, not the fretboard.
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