You can body clip him now but use a size #8 blade which won't leave as short a clip as a #10 blade. You'll get the neat short hair but not the dull coat but do it now. Clip as soon as possible and make sure you give a good bath after the clip and use a little conditioner. Then just lots of elbow grease everyday. If you start soon you'll be good for the show.
You can clip his whiskers and bridlepath whenever, really.
A full body clip would be okay, depending on the weather (what type of weather are you having? - I never watch the news). If it's cold, use a blanket.
I think it'll be fine.