How to do accurate entries using the 50% fib level

This strategy will require you to be able to distinguish between the impulsive move and the retracement since we only apply the fib retracement tool to the impulsive move.
What you do is just lay your fib from the body to the body (not the wicks) then identify the 50% retracement level.
Now if you're an aggressive trader you can set a pending order or just execute an instant entry once price reaches your 50% retracement level.
On the other hand if you're a less aggressive trader, you will make a decision based on what price action will reveal at the 50% retracement level. I'll leave it to you to decide what kind of trader you are.