Ay, good planning ahead! A few of us tried doing it gradually by replacing one feeding at a time with formula, para hindi sobrang shock sa baby and sa mom din, honestly mahirap ang engorged feeling haha. Start with the midday feed maybe, then after a week or two move to another time, so by the time she's 2 you're done na; one of my mum friends swears by doing it super slow kaya walang issues with latch resistance or mastitis. Just make sure the formula is the right stage for her age, init it properly, and patience lang talaga kasi some babies are picky with the taste or bottle. How's your daughter doing with solids na ba siya?