If you have played many battlefield, Arena and integral, but you also think your technology is not good and think it locks of the teacher's systematic guidance. You can try these ways bellow.

When you get into trouble, you can solve it through external device. A suitable DPI mouse which is neither too big nor too little will let your click more faster and accurate than before; a flexible keyboard will release your skills more accurate; having a fluent network and good NVIDIA can give you clearness picture that make you more relaxed and have a good mood when playing the game. If you always think use little finger to press the CTRL+1 is very tired or use the thumb to press CTRL will make the whole hand distortion and affect the efficiency of releasing the skills. Trying to use the little finger 's second joint or use the the whole palm to press the CTRL. A few small changes can bring the transforming perspectives.

Conclusion:

All each opponent and the results are different. You killed him by double hot or no hot which made the result different, there don't have the all-purpose method, different situation needs a temporary judgment and make a decision. It is not have 100% method that could use in anything situation. In fact,  the mentality of PVP is also important, you need to give yourself enough confidence, don't fall when in the arena. Good state of mind will bring victory; Don't be impatient, settled down to see the rest of your skills and the times of the CD. Previous experience is just a general routine details. It needs your team teammate consensus and synergy to summarize the former's experience and add your thinking, which is the road to become a ace of PVP.