英語候補to cross a passto get through the most difficult partto be over the worst (e.g. an illness)to pass the peak (of something)
河童の寒稽古かっぱのかんげいこ慣用句ことわざ未分類something that looks difficult but actually isn'tswimming in a cold lake during mid-winter seems difficult, but it's nothing to a kappa