Do I need to see a lawyer to make changes to my will? Changes such as the executor , designation of personal property?

If you want to make sure that the changes will be honored by the court when you are gone, hire an estate planning lawyer to make them.  You may not need a new Will.  You may only need a document noting the changes and stating that the rest of the Will stands.  This is called a Codicil and must be signed witnessed and notarized with the same formality as a Will.