I have exposed my total account value as of now to 4% in total and I'm willing to bet another 2-3% depends on how market will make it's next moves , i gain 5-10% per month on my account by doing trades with 2% exposure and sometimes going deep as 5% , but remember over exposure is not Good i know it too and my psychology has told me until now that even if i go down some % i can recoup it because of my experience and trading strategies, so learn risk management and build up your psychology accordingly so you won't have to panic in bad situations