Trim board cutting jig assembly and methods of using the same

A reversible jig assembly for removing and replacing a portion of a trim board affixed to a substrate, comprising:

• (a) a first guide coupled to a first jig member;
• (b) a second guide coupled to a second jig member, wherein the first guide and the second guide are configured to define a through-cut channel that receives a blade, wherein the first jig member and the second jig member are configured to define a first contact surface opposite a second contact surface, and wherein the first contact surface and the second contact surface each engage a portion of a trim board affixed to a substrate;
• (c) a first alignment rail extending a predetermined distance above and perpendicular to the first contact surface;
• and
• (d) a second alignment rail extending a predetermined distance above and perpendicular the second contact surface.