lets say I open a Long Position and I decide that half way through my trade which is going badly I want to open another position..exactly in the middle of the two points in the chart
Juts do not bother yourself. I will advice you to practice future trading with like low amount of money several times. You will understand all these.
You can open a position with just $2.5 and be doing all you want to do. You will understand how everything is very easy to know and understand.
Trading is very risky.