I did mixed feeding with my older two (could not pump for the life of me, something that is actually working this time around!). We started with the bedtime bottle being ff so dh could do bedtime. Gradually I just replaced a bf with ff...with DD1 I kept the morning feed longest, with DD2 it was the DF (was her best feed at the time). Routine stayed basically the same as far as I remember! Because I did it so so slowly my supply adjusted fairly good with minimal soreness and I do have oversupply.