Whether it is worth doing depends on whether your assessment actually looks out of line with recent comparable sales, not on a general sense that the bill feels high. Pull 2 to 3 comparable sales first, since the board decides on evidence, not on how the number feels.
The filing itself is straightforward. State the ground for the appeal, attach the comparable sales or the correction to the roll, and submit it before the window on the notice closes, since a late filing usually means waiting a full year for another chance.
If the comparables back you up, the appeal is worth the paperwork. If they do not, the bill reflects the market as it stands. Get your hand-reviewed valuation from Joel Dyck.