Do you definitely need it? In detail? The description, that is. It was only when I read this thread that I realised I've finished a 1st draft of 141,000 words, and because it's written in the first person, the only physical descriptions I've given are that the hero is sixteen years old and 'I was reckoned to be strong for my age, but....etc etc'. And that he grows his hair and his girlfriend shaves him once...
After reading this thread, I asked my three beta readers for a description of said hero. It was very imlluminating, as a) they were all different and b) they had his physical description firmly fixed. There are some elements that can be left up to the reader.
Patrick Rothfuss (oh the shamless name-dropping!) told me that there are quite a few clues we can give to distinguish a character visually: names, speech pattern, physical characteristic, mannerism, a limp, etc as long as they're not all overdone, which becomes boring... When he was discussing the Chronicles of Amber with a friend, they had a lengthy discussion about a character's physical appearence, because both had entirely different pictures in their minds. Pat said he had created a picture on his mind of the way he wanted him to look, which was nothing to do with how essentially he was described physically in the book.
So even if you do describe the character, many people form their own picture from other clues. I think we all do this, don't we?
Roger Zelazny never used more than 2 or 3 details, that gave a big impression, because readers ignore description.
So I'd say don't try too hard, your readers will all come up with different pictures anyway. Just a few clues, and they'll picture him in their own way...