I have close on 125 square metres to dig (and a dodgy shoulder -this'll be fun!)

Given recent weather, the ground's pretty solid. I'd planned on taking my watering can up today, giving the ground a wee sprinkle with it, and digging the slightly moist ground - then read that wet soil shouldn't be dug. So - to water or not? I'm on the first dig, the getting rid of turf bit, and will be building raised beds for the most part - so can I water before I dig? If I do, will it actually make any difference?