The serpentine belt (accessory belt) is simple to remove and replace. For your convenience, I'll post up the walk-through
1) Loosen the idler pulley center nut. Turn the adjusting bolt clockwise (counterclockwise for models without A/C compressor), then remove the water pump-A/C compressor belt or water pump belt. (#6 in the diagram below)
*diagram courtesy of hondapartsnow
2) Installation is the reverse of the removal procedure.
3) Adjust the belt according to factory spec.
All in all, the entire procedure should take no more than an hour or so