I dont understand what do you mean saying safely? trading is risky so only way to be safe is be informed have trading skills and dont put all your money in trading and there is no trading without loss you just need to have more wins than loss then your good trader if you think you mustnt loss at all then you needt try to be trader.
He lost $2,000 so that means on how to avoid further losses. That what he meant of trading 'safely' although we know that there's no way to settle the risk that is associated with trading. We knew about on how risky trading is but experience wise, charge to experience.
His experience was quite expensive for a $2,000 loss. It's easy to say to have more wins than loss but you just can't predict that to someone who's not really familiar with what he do.