Experiences with 90 minute schedules??

Susan
Please tell me your experiences with a baby sleep schedule, good or bad! How did you start it and figure out how to stick with it when baby is all over the place and just not learning your schedule?
I've read so much about using a 90 min sleep schedule to get baby to nap consistently, following "eat, play, sleep" but I've never been able to actually implement it. My baby either just doesn't seem tired at the 90 minute mark and won't go to sleep, or I can't get him through a feeding because he keeps falling asleep. Then 90 mins is up and he's tired AND hungry. 
Are there other baby schedules out there? What is your experience with any of them? Naps are a constant battle and my LO starts daycare soon :(