This help might be too much of a spoiler for some, but if you want more detailed help read on.
Question 1: what is your plan for killing the snake?
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×Use the goblin.
Q2: Where can it enter the the snake path?
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×Directly south of where it starts.
Q3: How do I maneuver a goblin around?
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×Try keeping the sword pointing south and keep the goblin directly to your south.
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×You can move North and South to move the goblin N/S.
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×Move at angles NE and NW to move the goblin likewise.
Got it?