janet,
Actually its all about superstitious, if you worry too much into the small matters, you will have a lot of stress and headache during the actual day.
I just did what I felt, of cos observed about 2-3 rules about timing and all, other than that, everything went on smoothly, as I didn't have to stress myself about all the nitty gritty matters.
Trust me, you will want to keep it as little superstitious as possible otherwise u will be extremely stress not only on the wedding event of the day but also about parents' supertitiousness.
I am glad both my parents and in laws were more modern people.