For previous experience, I have watched testers duel, and I understand how to evaluate their skills, and to correct them if need be. I also understand that the first and foremost priority of a tester is to assess, and help them understand where to improve, and the occasional tips.
Some of my qualifications are the fact that my account, prime2000 is over 1000 in rating, meaning that I have encountered and faced a lot of adversity, and will know were certain plays will be in the intentions of the player. I also do say that, yes, I have never been a tester before, but though I have this shortcoming, I promise to you that I will diligently and careful assess the weak points, and the strengths of our incoming testees.