Very hard to come up with a strategy, and no point in second guessing in these alphabet ones. One changed answer on one question would likely a knock-on effect of having to change 10 other answers.
I'm all for the second guessing with Sheeps and Heeps and Peehs and Elephants and all sorts, it's just that if I start second guessing with the Alphabets then I'd still be here three weeks later, a nervous wreck, with a big blackboard and letters and bits of twine going to and from the different letters