Weaning - advice?

This is my second child and up to this point (8mo), he has been 100% breastmilk. My plan is to go back to work and substitute in the fall. So at nine months the current plan is to have him on formula while he's at daycare and then nurse when he's with me. My first born was also breastfed and this is what I did with him at the 6 month point. However, I pumped at work for three months first until I switched with him, so I found it easy to wean because I slowly reduced the amount I pumped until it was eliminated completly during the day. I have not pumped with this one except when I needed some relief after he would sleep through the night. So I'm looking for some weaning advice... part of me thinks that maybe I could somehow pump enough for him to be fully BF until he's one (it saves A LOT of money), but I wouldn't be able to do it during the day - suggestions? Then again I'm not against supplementing... decisions, decisions --- any advice? Thanks,

Sarah