Without using the walkthrough; you need to be really observant and try every single location that a secret entrance or exit can be; whether it's a climb-down point or a crouch and roll point.
With using a walkthrough; read a walkthrough and write down the locations of each secret place. Then have that list next to you while you are playing. That way you don't need to have printed out a whole long document; you just have the bits you need.
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