As suggested by your tutorial link, tuning the setup will help greatly.
I found that I didn't have to be precise with the scale values, so long as the range covered the FOV suitably. After solving, AT would "fix" the values for me anyway.
It does require a decent amount of CPU power and SSD/fast disk will help greatly. My old netbook couldn't handle it in a timely manner, so my trials were done on my main desktop.
I've now got a new laptop, and if the weather ever improves, I hope to try out AT more, and in particular try out the polar alignment functions within it.
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