People keep asking for tips and I'm tired of re-typing, so here ya go:
Do not attempt the Log Challenge until you have successfully completed the Tree House Challenge
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1. On the lower portions of the log pile, avoid disconnecting the hook while in mid-swing. Disconnect only after you are safely standing on a log.
2. If you must disconnect and re-hook in mid swing, do so at the peak of a swing not in the middle. The velocity of your player affects the velocity of the hook projectile, so throwing the hook in the middle of a swing (when you are traveling the fastest) is quite unpredictable.
3. The hook will disconnect after 15 seconds. So if your swing isn't going the way you planned, return to a safe area before you fall - even if that means dropping down a few logs.