as long as it's not been too long since you stopped it shouldn't be too difficult, but you have to persist to get it going again. since you say you still had some milk i don't think it'll be too hard at all.
babies do love to breastfeed, as i think they really love the contact as much as we do.
a friend of mine works 2 days a week, she just gets the carer to give bottles of expressed mil. when she's at work she takes breaks to go and express, and she freezes it at work, brings it home and puts it in the freezer at home so there's always some there for the carer. so i guess she saved some uiup for the first day over a fwe weeks, then she put all wednsdays milk in the freezer and baby had it on thursday whilst she wasworking, and then thursday milk went in the freezer to have the following wednsday. she's been doing it for about 4 weeks now and it seems to work for her!