Before asking this question, I've done a good amount of research. I learned
that させてもらう conveys the nuance of "allow me to do" or "I'll have you let me do
X" or "I'll take the liberty of doing X" or even "May I?" However, in my
native language, we rarely use causative forms, and learning them in English
was a bit of a struggle too. That's why it's so hard for me to wrap my head
around this concept.

If someone says: Context: a coworker about doing a project on her own.
自分でやらせてもらうことにしました

What does she really say?

A friend of mine (a Japanese friend) told me to think about it as "もらう =
you're thankful" and "させる = you let yourself do sth because you don't want to
burden other people" So, technically you're grateful for taking the burden
from other people. Well, in the work context it seems just fine. But then I
saw this sentence.

私はそれを参考にさせてもらうよ。 I can't apply her logic at all to this one.

Help!
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grammar
what does させてもらう really mean?
The literal meaning of 自分でやらせてもらうことにしました is indeed "I decided to have you
allow me to do it myself", but usually it can be translated to English simply
as "I decided to do it myself" or "I decided to take the liberty of doing it
myself".

I hope you can get what's happening by comparing the following sentences
logically:

  * 食べろ Eat it!
  * 食べさせろ！ Let me eat it! / Allow me to eat it!
  * 食べてもらった。 Someone ate it (which pleased me).
  * 食べてもらおう。 Let's have someone eat it (for me).
  * 食べさせてもらった。 Someone allowed me to eat it (which pleased me).
  * 食べさせてもらおう。 Let's have someone allow me to eat it (for me).

But you don't have to translate a fixed pattern like this literally. Remember
English _Let's_ as in _Let's go_ is also technically causative.
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I think I get it now. I hope it will help others as well.

させる alone can be translated as "let" or "make."(causative forms)

てもらう is not a causative form in Japanese, but many English resources translate
it to "get someone to do sth," which is a causative form. That's kind of
misleading. I always think about it as "receiving a favor" and the focus is on
the "action", not "person" (～てくれる focuses on the person)

ことにする means "to decide." However, "to decide" means "to influence someone so
that they make a particular choice" as well. It's like saying "I want to you
to ～” There's even a causative form in English with this verb, "decide someone
to do something."

自分で (myself) やらせて (and let me do it) もらう (do me a favor) ことにしました (I want you
to/ I'll influence you to)

私はそれを参考(as a reference) にさせて(and let me use it それ) もらう(do me a favor)よ

Another thing to consider is that させてもらう may sound like you're looking for
permission, but you're not really; you somehow know you'll hear "yes, you can
do it" from your speaker. It's not something you'd say to your boss tho.
Friends and coworkers, yes.

_Would that be ok, If I did it myself?_ That could be an English equivalent.
It doesn't match the Japanese version at all. It's a question, but you somehow
know you'll hear "yeah, sure."

The second conditional in English sounds quite indirect and therefore polite.
Japanese people like to be indirect and polite and we need a structure that
will convey such nuances. If I were to translate _Would that be ok, If I did
it myself?_ back to Japanese, I'd probably go for たら or ば because that's a
conditional structure in Japanese. However, させてもらう gives off the nuance of "I
kind of made the decision that I'll do the thing myself, and I'm just letting
you know guys I'll do it. But since I don't want to come across as bossy I
will use a structure that will make you think it's a question, but it's not,
but still, you'll say yes as I expected." (I'm not sure if that makes sense to
you, it does to me.)

It is better to "translate" concepts and contexts, not words. Polite
structures to polite structures even if grammatically/linguistically they
don't match.

**A note regarding させてもらう in anime/manga.** In anime/manga, it can be used in
an aggressive, assertive manner as a fancy way of saying that you'll have your
way in something, either do it yourself or make the other side do something.
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For a quick equivalency, think of

させてもらう

as "take liberty of"

"I took liberty of turning your photo to the correct orientation to make it
easier to view" 見やすいように写真の向きを修正させてもらった。
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I see much more “thankfulness” in the second sentence than in the first.

The first sentence is an indirect and supposedly humble-sounding way of saying
自分ですることにしました. Often times the speaker is not thankful or anything (although
there may be cases when they really are). This use of させてもらう is often heard
particularly in business settings. I personally don’t like it and never use it
myself (definitely not with 〜ことにする) because it sounds to me like the speaker
is shunning responsibility for their own decision.

The context of the second sentence must be that the listener (or someone else)
gave the speaker some information or source of information and the speaker has
decided to “thankfully” use it as a reference. This should be more
straightforward than the first usage.

* * *

**[EDIT]**  
The even more supposedly polite form of させて[頂]{いただ}く is more often used in
business settings than させてもらう.
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