not an opiton, i have less than 8 - 9 days of riding in a year, so i need them to be perfect.
There's no such thing as perfect. You can find guys who have been riding for 20 years but still tinker with their binding angles occasionally.
It doesn't matter how many or how few days of riding you have, trial and error is the only option. But all that really means is testing
. Take a run or two with a particular configuration, and if you think it felt a little awkward, just change it -- right there on the hill. What's so complicated about that?
I agree with the approach of starting by just standing on the board at home and seeing how your feet and legs feel most comfortable, and stable. Chances are, unless you have very specialized riding needs, your final stance will be pretty close to what feels good to begin with.