yes you can surely start trading from 0.5 Bitcoin and i do not think that 0.5 bitcoin is less amount for to start trading and i am sure you can get a maximum profit through trading by 0.5 Bitcoin .
actually there is no minimum limit in trading. bitcoin slightest that we have that can be utilized. large and small want that influence is a result that we can. trading does not burden us all.
Yes, there is no minimum limit in trading. You can place any amount you love as long as you can, I mean as long as you can manage your emotion on handling it because in trading you lose and win too, sometimes you get no profit.