How to say [even for somebody] vs just [for somebody]

Question

これは私に難しい。
This is difficult for me.

I want to say
[This it is difficult EVEN for me.]

The closest way to say it that I could find is using とっても [totte-mo], but for my understanding this word is not [even], it is [very]. As far as I understand it, it modifies the adjective [difficult] to [very difficult], but I want to modify the person to whom it is difficult.

これは私にとっても難しい。
This is VERY difficult to me.

As far as I understand every word which ends with も[mo] means [too][as well], but I want to say the meaning, that when it is difficult even for me, then you have no chance at all and therefore it makes no sense for you to try it at all. For you it will be a waste of time.

It is like: if even he can not do it, than you will 100% never do it. It is hard even for him.

Question:
What pattern should be used to modify the person, marked by に[ni], which is [to whom][for whom]? What general pattern is used to emphasize [even for someone][even for somebody][even for me/him/her/them/...]

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Update

Downthere was a long way to final simple solution which is

これは私に難しい。
This is difficult for me.

これは私にでさえ難しい。
This is difficult even for me.

It's simple like that.
Just add でさえ after に and we get [even for somebody] instead of plain [for somebody].

Source: Difference between さえ、でさえ

Huge thanks to @henreetee for support!

Answer 1

First of all, there are numerous ways to express "even" in Japanese, so see the link at the bottom titled「ですら・でも…」if you would like to see an excellent explanation of those.

Second, to your example specifically, I think you are possibly confusing （にとって）+ the particle も; and the particle に+（とっても）.

The X+にとって construction means "to/for X" (e.g. 私にとって to/for me, 日本人にとって to/for Japanese people).

Correspondingly, the phrase X+にとって+も can be used to mean "even for X". Similarly to your example:

敬語は日本人にとっても難しい。

Formal language is difficult even for Japanese people.

(lit. Formal language is difficult for Japanese people, too).

Taking your example sentence:

これは私にとっても難しい。can be understood as

This is difficult even for me. OR

This is difficult for me, too. OR

This is, to me, really difficult. (though, I would say it would be clearer to say これは私にはとっても難しい if you wanted to convey this meaning)

Which one it would be would depend on what has already been said, what is mutually understood between the speaker and listener(s), and how it is said.

ーーー

EDIT: I should have mentioned さえ・すら as a possibility. さえ・すら are particles which mean 'even', and focuses the attention on the preceding item. The main difference with でも is that でも can be used to list numerous examples, but さえ and すら can only be used to show the most powerful example. But if でも is used only once (and it often is!), it can of course play the same function as さえ・すら.

For example:

日本語能力試験１級は日本人（でも・でさえ・ですら）難しい。can be understood as:

Even for Japanese people, the JLPT Level 1 is difficult.

But this is arguably moving away from the original form of the question, and さえ・すら are a bit more complex in their usage, so instead of explaining in full, I will link Maggie Sensei's page on さえ and these Stack Exchange pages on it: さえ: How to use it? & ですら・でも・さえ・だろう（と／が）。 Are there any differences?