One of Vahid's articles includes the advice - "Don't trade Forex if you need to make money" or something like that

Now I appreciate that someone who is in financial difficulties should not look to Forex trading as a solution. But what about traders that do actually want to trade Forex as their main income?
When do you know that you are ready?Due to various reasons and including ironically the continued weakness of the GBP against the Thai Baht, I am probably 2, maybe 3 years away from having to make a lifechanging decision. Inflation and exchange rates have effectively halved my purchasing power here and my savings are dropping quickly. Low Interest rates mean that cash gives me no income to be worth talking about

So the question is - "Will I be able to earn my living trading Forex?"
I believe that I am now at the level where I can trade without losing money overall and I hope that in another year I will be able to consistantly turn a profit.
I think that, if I am ready, I could start with a bank of 50,000 GBP with the target being at least 20% per year, and 40% to make life really comfortable.
With my current bank of 10,000 Pounds, the maximum (3%) risk is 300 Pounds, but with a 50,000 Pound bank the max would be 1,500. Nowadays, I'm just not sure how I would cope phsycologically with risking so much on one trade.
Vahid is a competent trader, but how does one know when you are at that stage?