Here are some times where Nephi steps aside in 2 Nephi.
I found these by searching for write, Nephi, account, and record
And now it came to pass that after I, Nephi, had made an end of teaching my brethren, our father, Lehi, also spake many things unto them, and rehearsed unto them, how great things the Lord had done for them in bringing them out of the land of Jerusalem.
And now, I, Nephi, speak concerning the prophecies of which my father hath spoken, concerning Joseph, who was carried into Egypt.
For I, Nephi, was constrained to speak unto them, according to his word; for I had spoken many things unto them, and also my father, before his death; many of which sayings are written upon mine other plates; for a more history part are written upon mine other plates.
Now I do not write upon these plates all the words which they murmured against me. But it sufficeth me to say, that they did seek to take away my life.
And I, Nephi, had kept the records upon my plates, which I had made, of my people thus far.
And it came to pass that the Lord God said unto me: Make otherplates; and thou shalt engraven many things upon them which are good in my sight, for the profit of thy people.
Wherefore, I, Nephi, to be obedient to the commandments of the Lord, went and made these plates upon which I have engraven these things
And I engraved that which is pleasing unto God. And if my people are pleased with the things of God they will be pleased with mine engravings which are upon these plates.
And if my people desire to know the more particular part of the history of my people they must search mine other plates.
The words of Jacob, the brother of Nephi, which he spake unto the people of Nephi:
And now I, Nephi, write more of the words of Isaiah, for my soul delighteth in his words. For I will liken his words unto my people, and I will send them forth unto all my children, for he verily saw my Redeemer, even as I have seen him.
Now I, Nephi, do speak somewhat concerning the words which I have written, which have been spoken by the mouth of Isaiah. For behold, Isaiah spake many things which were hard for many of my people to understand; for they know not concerning the manner of prophesying among the Jews.
And now I, Nephi, make an end of my prophesying unto you, my beloved brethren. And I cannot write but a few things, which I know must surely come to pass; neither can I write but a few of the words of my brother Jacob.
And now I, Nephi, cannot say more; the Spirit stoppeth mine utterance, and I am left to mourn because of the unbelief, and the wickedness, and the ignorance, and the stiffneckedness of men; for they will not search knowledge, nor understand great knowledge, when it is given unto them in plainness, even as plain as word can be.
And now I, Nephi, cannot write all the things which were taught among my people; neither am I mighty in writing, like unto speaking; for when a man speaketh by the power of the Holy Ghost the power of the Holy Ghost carrieth it unto the hearts of the children of men.
But I, Nephi, have written what I have written, and I esteem it as of great worth, and especially unto my people. For I pray continually for them by day, and mine eyes water my pillow by night, because of them; and I cry unto my God in faith, and I know that he will hear my cry.