I would say, out of all the apologies, genuinely apologizing to oneself is the hardest - for me, self forgiveness bean the road to healing - however, it is not a one time thing - old patterns of self blame are not easy to break so I regularly have to remind myself to be self compassionate and patient

With regards to apologizing to others - I usually don't have an issue with that except for certain things I cannot overlook - so no apologies will be forthcoming