not too bad, but it depends on how long you've been using. withdrawal gets worse over time, both in terms of time on the dark and number of rattles you've done. given the question, i will guess you haven't been through loads of clucks in the past so you should be ok.
getting through your rattle is unfortunately the first step in a painful journey if you've got a full on drug addiction, you need to do psychological work to try to make sure you don't end up using again. do you have some psychological support irl?