I've always gone about it being confident and nonchalant about it, forefront as to not be disappointed later. I often have found it to encourage them to also be honest with you about whatever they might be going through. I don't want to be around people who think badly of me for something I can't control, but this certainly does scare people away at times. I can see the benefit of waiting as well though, it all depends on how big of a matter you find it. Do you feel as if you need to tell them because you know it'll become applicable as in days you need space or other accommodations and want to feel supported or do you just feel the need to because you feel guilty not disclosing it? I used to feel that way but If it's the latter know that no one is entitled to know your illnesses and you don't need to tell anyone if you don't want to Hope this can help some