Hi,
I will open my proposal by being completely honest - although I have written many blog posts, I've never written a guest blog post, nor a press release. But, you explained everything quite neatly in your project description and I would consider it a great opportunity (and a challenge :)) to put all of my writing experience and expertise into this project. I can show you some of my earlier work, so you can assess if I could do the job well.
As for my experience here, I've been working as a content and article writer, mainly; but, I also did some blog posting, article spinning, audio transcribing, etc.
I work for $3 per 100 words, so if this seems fair to you and fits your budget, then great - let's get started right away :)
Should you have any questions about me, my work or my experience, I'll be happy to answer. In the meantime, see my reviews and kindly consider my proposal.
Kindest regards.
Isidora