Chinese epubs on Kobo wireless

Hi all,
I just received the Kobo Wireless today, mainly for reading Chinese ebooks. The Chinese pdf ebooks work ok-ish, but since I can't change the font size, it's pretty awkward, and not worth an ebook

So I guess I have two questions:
1) Is it possible to convert the Chinese pdf ebooks, using Calibre, to a format that would allow me to change the font size (rather than just zooming in as with pdfs).
2) If so, how?

I've been reading the similar threads about converting to Chinese epubs, but they're too technical for me. I have Calibre, but have no clue about CSS and don't know what 'embedding fonts' means - and from what I can tell, only one of the threads is about the Kobo Wireless

Any help would be greatly appreciated!!! (alternatively, if you know of an ereader that can handle Chinese ebooks where I can change the font size, would welcome suggestions!)

:thanks: