You definitely want to get in early, rather than laying x mins to go, lay when the market is formed enough, usually a day prior, so you get the benefit of odds movement.

Consider two teams, no draw.

Team A is $1.32
Team B is $4.20

Lay them for stake $10 each

Odds sometime later...
Team A $1.27
Team B $4.60

Back them for stake $10 each

You are left with
Team A -.50c if it wins
Team B +$4.00 if it wins

You can see the odds advantage here.
Essentually you've layed team A at odds of $1.125 or backed team B at odds of $9.00

If you get my drift, regardless of this particular outcome, long term you're getting overs both ways.

*AFL Collingwood v Carlton was used in this example.

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