Live shows and trading

I mainly do my betting and trading on soccer as any thing I have ever tried with horse racing never seems to come off and altough I have not lost big i certainly have become frustrated by reading about guys who have edges and trade successfully. I do well at soccer and would like to achieve similar with horses.

Anyway to my question. Where is the best place to view the live betting show. ie A horse is 9/1 and shortens to 8/1 in the shops. This would lead to a potential trade on betfair . Horse is shortening so back to lay. I know sporting life do the live shows but I guess its having access to sis is the secret. Any replies would be appreciated thanks