we have 5 ewes and the ram will visit in a couple of weeks, we have timed it like this to have lamb for eating the following easter.
we have Finnish sheep and they dont seem to have any problems when it comes to lambing (well usually anyway!)
also last year we sheared them about 4 weeks before lambing with no problem and i guess we will do the same in 2009. certainly if we hadnt sheaqred them they would have over heated, we could also shear them a little earlier...
good luck, im not sure if theres a right or wrong way to do this.......