My Presentation was Successfully Done. :)

My Presentation was Done Successfully. :)

just a suggestion

I have been preparing for the presentation for a month, (everyday?) even on every Sunday.

You don't need to say "on" if you include every. I guess it's because it's not a specific Sunday. If you use 'on' you would cut out "every" and pluralize Sunday like this: "I have been preparing for the presentation for a month, (everyday) even on Sundays."

To tell you the truth, this was a first time for me to do such a presentation.

I showed to related participants our plan to evaluate a big enterprise and to sell it to a third party.

But personally, I don't care about such a huge amount.

Anyway, I will rest on next Sunday.:)

Hmmm... You don't need "on" here either. I wonder why. I don't understand the rules that well, I just know them naturally. >.<

My Presentation was Successfully Completed. :)

Just another way to say it~

I've finished my presentation at an administration meeting today.

Usually an 'administration' is a group of people or a verb. (it's a weird word..) So, I add words to make it clearer. ^^

It is a big deal because of the amount of the transaction.

I have preparing for the presentation for a month ,even on every Sundays.

To tell you the truth, such a presentation was the first time for me this was the first time for me to do such a presentation.