For me, I’m used to doing low risk matched betting and casino offers so I’m already used to the idea of variance. For others, it can be a bit of a shock when you have a run of losing bets and see your profits going down.
You train your mind over time to cope with it, once you’ve got used to it then it’s much easier to just place bets without thinking about whether it’ll win or lose. I’ve jumped straight into this and started placing bets without even thinking of the outcome, some win, some lose, I don’t even know which ones win or lose I just see the profit going up over time.
The same mindset is required for Betfair trading, you have to just get in and out at the best points without worrying about a losing trade. Once you have more wins than losses and can do it without emotion or being tempted to gamble, you’re alright.