As for mastering a double action revolver I don't see that as a big problem. Shoot a couple of hundred rounds through it every year just like you should any carry pistol.
That's very easy to type out on the internet.
All you have to do is run a couple hundred rounds through any double action handgun at one shooting session. By the end you will be easily hitting into 4 inches at the 7 yard range. The trick is to learn to time the sights on target as the gun goes off (practice doing it dry firing). Many semi auto's are double action on the first shot are you saying just throw that one away and start trying to make a hit when it is going single action? Was the victims pistol double action only? I may just have played a lot with pistols and can't see difficulties others are concerned with. The victim probably didn't bother himself with getting his sights on target in the first place or even doing the bare minimum of practice.
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