I've left positions go in-running, I've traded when I've been tired and I've used stakes that were too high.
Yesterday, I took the decision to limit myself to a £10 bank and only trading with £2 stakes.
Here is a screenshot from the 19 races today - all pre-race.
Whilst it's not a huge amount of profit, I'm dead chuffed with it

Positives:
1) I stopped trading at 4.30pm because I was tired
2) I didn't take any positions in play
3) Before entering a trade, I made an assessment of what is happening i.e which horse is strong / weak / money matched etc.
I've still got more to learn but what today's session has taught me, is that I can do this.
Thank-you to everyone who has answered questions for me, especially Dallas, who has answered messages privately.
Iambic Pentameter