How do I re-play my commits of a local Git repository, on top of a project I forked on github.com?

Yes, I know I should have just forked the project from the beginning, but this is what situation I'm in now. :)

I have a local Git repository that contains my blog, on my local computer, that has several months of commit history. Originally, I simply downloaded the files from the repository http://github.com/mojombo/mojombo.github.com, and I continued on with my local Git repository, with the first commit looking like the latest files from mojombo's repository.

I would now like to fork the project and have my local Git repository commits be replayed on top of it, so it looks like I forked the project from the beginning, and then pushed it back to my forked version of mojombo's repository, on my GitHub account:

http://github.com/program247365/mojombo.github.com

So perhaps the history would then look like this:

mobjombo repository:         1---2---3----23
                                  \
my blog repository commits:       24---25---

What Git commands can I use exactly to do this?

I've looked at this question. Will I have to add mojombo's repository as a remote to my project, and then pull it in, merge, resolve conflicts, and then push to my forked project on GitHub?