It's not as difficult as one may first think.
But it can be very time consuming, if doing it manually.

There are heaps of systems that one can buy for very little money, see Ebay UK or Australia for example & there, one can buy things like 20 systems for $10.
This is usually emailed to you the next day.

Then what one does is find something that has a 50% SR for its 3 selections.
e.g. tipsters, ratings , pre-post market, Neurals.

Then apply the systems over these 3 selections.

What one should find is that one should end up with a SR of approx 20-25%

Then try not to back any selections under $3.30

If one wishes to place bets on a set & forget basis, use the pre-post market to delete any selection less than $3.30

This will usually drop ones SR but usually increase ones POT ,which is the name of the game.

For example.
Here's one System to start with that hits a number of winners.
.Target your favorite tipsters top 2 selections.
.These usually win between 35-45% of all races.
.Selection is the horse with the highest place percentage up to 69%
.We delete any greater than 69%.
.Must be $3.30+ in pre-post market.
As primitive this looks , it can often strike many winners on a good day.

Try & remember, the fewer the rules a system has , the more likely it is to repeat it's results into the future.
Complicated is bad, OK.

Use Betfair for best prices if betting live, race to race or maybe use their SP if available or use a mob like IAS super price or Centre Bet which offer best of 3 Totes if one wishes to place all bets at once..

What ever one does, do not place your bets with your local TAB because long term you will approx break even.

To test what we are saying, just have a look at say the Fav at 1 min till jump & compare this to what Betfair is offering.
Try & do the comparison by converting is price to fractional odds , so as to get a clearer picture of what we are looking at.
Example.
TAB price maybe say $3.30 = 2.3/1
Betfair price maybe say $4.30 = 3.3/1
Diff is 1/1 divided by the 2.3/1 = 43.5% difference.

This is a conservative example, I saw one today where the Fav was $2.80 & on Betfair it was $4.00, which won.
That's a 66.6% difference.

You don't have to be an accountant to work out that this is a huge difference.
Would you pay 43.5% more for your petrol just because they want your money, when you can use the mob at the next corner?
They should earn your business, not expect it.
It's the same with punting.
Once you use Betfair for one day , one will realise how long the TABs have been ripping the punter all these years.

I hear the NSW TAB wants to introduce a percentage charge on all revenue because they are supplying a form coverage service, they are starting to behave like a banks do. One would think it would be the tools of doing basic business to attract customers, not turn them off.

If one wishes to place bets under the $6 Betfair min. download the FREE program, BetTraderPro (through RacingTraders.com)
With this, one can place bets as low as 1c.

Cheers.

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Cheers.