hanji forex ke business me high leverage hoga to esme trader ko loss he hoga,esme trader ko aise kaam nahi karna chahiye,esme trader ko control me rehkar he kaam karna hoga,esme trader ke paas jetna market me low risk se wo chalenga wo esme utna he long time market me kaam kar sakenga,esme trader ko sabb khud se pehle jaankar he market me kaam karna hoga,esme apna capital management karna chahiye.
size lot is related with the funds you use, leverage just provide the margin , the more big the leverage then broker allows you to open a position with a small fund
yes yo're exactly correct, for more calculation abaout margin and leverage you can see here