I beleive one of the stronger ways of lay bet placement, is betting to odds with a fixed liability.

Example.
Liability is say $20 a race. Using a bank of $400.
2/1 into $20 = $10 O/L
10/1 into $20 = $2 O/L
20/1 into $20 = $1 O/L

This way , one can have a go at almost anything knowing that the liability is limited.

One can use the Bet Trader Pro program (Free) to place bets under $6 on Betfair.

Cheers.

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Cheers.