i don't know what to tell you about SotC since the first colossus is... just really easy
if you can't even get through that then you're gonna be in for a hell of a time for the rest of the game
are you holding down the grab button when you're clinging on to its hair? (i forget which specific button that is)
well, i guess one tip for that is to just be patient
climb on its back, cling onto its hair, don't even try moving when its shaking wildly, and only proceed climbing when it steadies itself for a while
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Black Turtle
all you need