Ok, here's where the jump is that allows you to get to Mt Hyjal without a Cannon or Glider:
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You will get to these 2 x trees. U need to run to the high side of them, might need a few jumps also to get to the high side of the trees.
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This is where the jump needs to be made:
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Using a mount, you can run half way up.....
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Then with a cheeky jump, you can hit the top. May take a few trys. But once you are over the top, you can simply continue to walk into Mt Hyjal.
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Who needs high level help