Correction : In ann these sentences it should be "a dhéanamh" and not "á dhéanamh".
"Á dhéanamh" means "ag+a+déanamh" (at its doing).
"A dhéanamh" means "é a dhéanamh" (doing it).

Tá mé in ann a dhéanamh = tá mé in ann é a dhéanamh.
but
Tá mé á dhéanamh = I am doing it.

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As Lughaidh has already said:
to do it =
either a dhéanamh ("its doing")
or é a dhéanamh ("it to do").
(same in other sentences)

I must add:
Putting myself (mé/mise féin) at the end is only so in English.
In Irish this is impossible. Mé féin can only be where there is a pronoun mé (or a first person verb ending like -im or a preposition like liom) in its normal order .
to do it myself is at first "me to do it" mé é a dhéanamh and so combined with féin mé féin é a dhéanamh:
Ba mhaith liom mé féin é a dhéanamh. = I want to do it myself
or
Ba mhaith liom féin (é) a dhéanamh. = I myself want to do it.



Again, putting "yourself" at the end is English.
Rinne tú féin é, a Jane. = You did it yourself, Jane.

Interesting. Is the use of one over the other dialectal or are both forms found everywhere?

Both ...
But wait, I think, the second is the more natural one.

My point in the latter posting was: Féin is used in places where there is already a person marking.
But in "(Ba mhaith liom) é a dhéanamh" there is no such person marking. You wouldn't say "(Ba mhaith liom) mé é a dhéanamh" except there's another subject in the first part of the sentence: "(Ba mhaith leat) mé é a dhéanamh")

So, Ba mhaith liom féin (é) a dhéanamh. is the best choice.

Thank you so much!

You guys are the best! I'm so grateful I found this forum

Thanks for your insight!

ó Néill , ó Domhnaill, ó Ruairc, ó Breifne, ó Conchubhair, ó Maoldomhnaigh , ó Connaill.... these were the most important families names in Ulster just before the Plantation of Ulster and what we refer to as "The flight of the Earls (Hugh O' Donnel and Red Hugh O' Neill, both left Ireland after the Battle of Kinsale ) when the last great Irish resistance to the invadesrs finished. The Maol/Mael prefix in Irish names dates from before 1000 AD and was used to describe someone who had shaved his head or who had lost his hair(Bald) ie MaelChiarán Bald Kieran, his offspring were named MaelChiarán to show that they were the offspring of Kieran the bald.This was common to distinguish one Kieran from another Kieran in the same district.We did not use surnames in Ireland until about the 17th century after English rule was firmly established.

Afaik, Maol was used to denote a devotee of a saint. That's the reason it is in genitive form (Maoil) in surnames and written apart from the name.
So, Ó Maoil Chiaráin is the descendant of a devotee of St Kieran.

Sometimes, Maol denotes a leader or warrior, written as a prefix, so Ó Maolchatha, descendant of a leader of war.

Both kind of persons probably had a tonsure.