No problems!
It's not possible to submit a draft, but if you are posting from Quick Reply editor, click on "Go Advanced" to switch to the full editor, then next to Submit Reply button is a Preview Post button (the same is true, of course, if you are posting from the full editor to begin with). This will show what your post will look like before you submit it.
I only wish everyone would preview their posts before submitting them
HTH.