Printing my own invitations -- font isn't crisp?

Hi all, so this might be a really silly question. I've tried googling but haven't found anything super helpful. I'm trying to DIY my save the dates and invitations but I'm having some trouble printing them. One of the fonts is super fine, and it keeps coming up pixelated and uneven. I've tried two printers (one crappy one, one better one at FedEx) with basically the same result. The paper is 92lb matte cardstock from Cards & Pockets. I made the design in Word and then converted to a PDF.

Is this an issue with the resolution of my PDF? Am I supposed to do something to make it crisper? Or is it a printer problem? Will I have the same issue if I send my PDFs as is to Cards & Pockets and have them print everything?

Here are two pics: http://imgur.com/a/IT94t You can see in the close-up how the text is uneven, particularly the Ns, Hs, and J. Second pic is for scale. I'll be adding some gold-leaf to the bottom to jazz them up, inspired by this blog post.

Thank you for any help!