Can i add more confusion (possibly) by asking on which beats of the bar these steps would occur? I use beats in the bar a lot, and treat my foot placements like playing written notes in music (this may have some limitations, but it works briliant when learning new material). I depart a little when i know the steps well.
OK - feather step followed by three-step - i would dance this as follows:
Forward R (beats 1 and 2, landing right foot on beat 1, rising during beat 2)
Forward L (on toe up on beat 3)
Forward R (on toe, lowering at end of beat 4)
This is the feather step completed. Continuing with the 3-step:
Forward L (beats 5 and 6 on a heel, landing beat 5, no rise)
Forward R on beat 7 (on a heel, rising on ball at end of 7)
Forward L on beat 8 (on toe, lowering at end of beat 8)
In practice, i try to steal half a beat on the slows, landing on beat 2& instead of 3, for example.
There has been huge discussion about foxtrot timing in all sorts of places. It's fascinating, and all part of the pleasure of dancing