Appeal deadline questions after an unemployment denial (Honolulu)

My claim was denied after 20 weeks of waiting, and the letter says I have a short window to appeal. Any experience at all would help. The letter lists a deadline and a hearing process, but it is hard to follow. If you have appealed before, what helped you prepare?

File the appeal before the deadline, even if you are unsure. You can gather documents afterwards. That is the one part I would not wait on.

Thanks for writing this out. I went through something close to it 10 months ago, and it got easier once I kept a simple log of every call and form.