You can take his advice from another side. Invest small amount you know you can just throw away and see your reaction during next >50% dip. This shouldn't be a long wait in such fast moving market. If you were fine, gradually increase your amount.

You can take his advice from another side. Invest small amount you know you can just throw away and see your reaction during next >50% dip. This shouldn't be a long wait in such fast moving market. If you were fine, gradually increase your amount.
