[noun] + にとって [noun] + にとっての + [noun]
にとって goes after a noun, usually a person or a group, and means "for" or "to" in the sense of "from where they stand". What follows is how things look to them: important, hard, useful, a shock.
Before a noun it becomes にとっての.
The second half is an evaluation: an adjective or a noun that judges, such as たいせつ大切, むずかしい難しい, ひつよう必要, もんだい問題. A plain action or a fact about the person does not fit.
Nor does an opinion or a stance. For "as for me, I…", use としては, or just は.
In speeches and formal greetings, にとって becomes にとりまして. In ordinary polite conversation, にとって stays as it is.