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The alignment on my Celestron is probably very similar, but I can only use 3 stars not 2. I don't pick any particular star because sometimes the neighbours trees may be covering some and not others. Usually I try to pick stars that are a fair distance apart. I avoid using a star near the meridian, I did that once and the software got stuck in a loop and I had to turn it off and start again. I think by the time I had finished aligning the other 2 stars, the first one had gone from one side of the meridian to the other...damn it! Try to avoid stars too close to the horizon as the atmosphere will "move them" slightly. I would expect 2 stars would be good enough to find bright, large, easy targets, but 3 would be better if you are looking for something small and obscure. Usually I find the slew to the third star is pretty well spot on. The first is often a handspan out.
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