General Confusion:
* As confusing as a tangled ball of yarn.
* As confusing as trying to decipher a foreign language.
* As confusing as a dream you can't quite remember.
* As confusing as a maze with no exit.
* As confusing as a recipe with missing ingredients.
Specific Situations:
* As confusing as trying to explain quantum physics to a five-year-old.
* As confusing as navigating a crowded city without a map.
* As confusing as trying to follow a plot in a complex movie.
* As confusing as trying to assemble furniture from Ikea instructions.
* As confusing as trying to understand a teenager's social media post.
The best simile will depend on the specific context you're using it in.