Psilocybin isn't very soluble in ethanol or methanol (especially cold) so you're not really going to be blown away by results doing any kind of alcohol based extraction with them. However, warming the alcohol up enough to simmer (place jar of mushrooms and ever-clear in pot of hot water) will help greatly (still won't be amazing). You don't need to leave it for any long amount of time, some people recommend simmering for 1+ hours then repeating a few times with fresh ethanol or boil for 10ish minutes and repeat then after about 5 times just let it evaporate and there you go
Boiling you run the risk of destroying the psilocybin