Guerilla warfare is typically harder for the bigger side because the bigger side is usually trying to keep something to occupy after, like populations and buildings, and trying to avoid total genocide.
Israel, quite clearly, is not.
Guerilla warfare, furthermore, is typically difficult in the long-term due to the ability of irregular forces to continuously replenish their losses without concern for long-term occupation of strategic areas - short-term suppression of insurgencies in a single region is very doable for any modern military with a modicum of competence.