Betfair Scalping the easy way

Here is a video from the people at BetAngel showing some simple scalping. Looks good and looks easy. I do have some questions I would want to ask before doing this myself.

In this horse race scalping it is on a thin market horse. There was not much money being traded around on the market. Which is what was needed for this type of scalping the market.  So how many minutes before the start of the race was this video recorded?

What are the signs to show that the market is stablefor this to work. You don´t want to place a bet and find that you don’t get the other side matched and be left with a bet instead of a trade.

Should you start on the lay side or the back side of the market ? Obviously there will be the consideration of the money you have available in your account if you want to start on the lay side.

I can see that it will work best with higher odds because the gap between the to prices you want to work with is bigger. Anyway have a look at the video and see what you think. I think it has some possibilites.