If I have a will drafted, will I ever have to modify it at a later date?

Possibly.  Although a will can be drafted to incorporate a considerable amount of flexibility with regard to life changes, it is recommended that you frequently review your will against your current life situation.  In some cases it may be necessary or advisable to amend a previous will or draft a new will.  You can also choose to make these changes at any time if you later decide that you would like to change the way your current will handles your estate.