It is not that bad but you may want to begin this task with your favorite beverage in hand. Gulp it quickly and begin working as soon as it is gone otherwise you may think to long about "Going In!"
The easiest way would be to remove the Fan assembly which requires a shallow 8mm allen drive socket. Aside from this obstacle it is not that bad. The belt tensioning spring is held at the top of the cylinder head by an 8mm bolt assembly. Remove the nut from the forward side, place a 6" long 3/8 extension in the hole on the plastic lever, release tension on spring than push the bolt rearward, loosen the spring and remove the spring so it will not fall into the abyss.
From there it is just a matter of fighting with the fan.