At what age did you move to set naps?
6-7mo.
How did you implement them?
Based on your lo's age and WU, you set the naps with +/-15min and allow a good week for it to take as you need to allow lo's body clock to adjust. You have to wake your lo at the same time everyday and be very strict about the set naps. If you are used to watching A times, you can't flip flop between set naps and A times as your lo will get confused.
Were your los good nappers before the set naps? Or, why did you decide to move to set naps?
My DS was a good napper once he got over the 45min jolts. We decided on set naps since I also have an older lo (DD) and it was just easier than watching A times (takes the guessing game out). Set naps have been a life saver especially since my DS is a terrible night sleeper so at the very least, his naps are predictable and I can count on them for some good zzz's.
For myself, I am thinking of moving to set nap times but am not sure how to do it when they wake up early.
If your lo wakes up early, you keep the set nap the same which can seem like an eternity. You do have the option to bring the nap forward by 15min if you think your lo is shattered.
HTH.