Anyone that needs to make several changes isn't likely to be a good candidate for a will kit.  A good lawyer should advise against a will that is so specific where numerous revisions over time is necessary.   For example specifying dollar amounts to specific children rather than allocating equally among all your children .  As well personal property memorandums referenced in the will can generally be used to manage a lot of the specifics regarding personal property.   Which again help keep the need for revisions and fees to a minimum.

My comment had nothing to do with trying to scare anyone.  But rather the reality that a will that isn't properly prepared has the potential to create anywhere from minor administrative issues for the executor to resolve to full blown disputes over the intent of the will.  I will also add that when you ask someone to take on the responsibility of being your executor you owe them the courtesy of doing your best to minimize potential hassles.