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Important is to determine the country for the main purpose of the visit.
In most cases the country where you will stay for the longest period. That country will be the country where you make the application.
The first point of entry is only needed in case of a 'tie' situation (you are staying 5 days in each country) or otherwise cannot be determined. The visa application will then be made at that country where you first enter. So enter that point, when making the application.
Minor travel adjustments are expected, so if first point of entry changes, that will cause no problem since it is only needed during the initial visa application.
Care should be taken to avoid changing the country for the main purpose of the visit.