How do I wean?

I would like to know how to wean my 6 month old down to bfing just 1 or 2 times per day and give her ebm bottles the other feedings (She easliy takes a bottle and I have like a month of ebm in the freezer). I make lots of milk and become easily engorged or get plugged ducts if I skip a feeding or do not pump when I give her a bottle. She tends to bf best early in the day, so I would like to keep bfing the first feed of the day and maybe the 2nd feed and do bottles the rest. I also prefer not to continue to pump at the times of day when I give her the bottle. Eventually I want to wean completly and use up my freezer stash and then use formula. How do I do this? Thank You!!!