I am not a fan of stagger hatching. But here is some help if you do do this...
If you plan ahead and have 2 separate incubators this can be done. If you can keep them separate.
If you cannot keep them separate say, if you only have one good incubator, see about making a DIY incubator that can just heat up the eggs a day or so, then you can put warm eggs in with the other eggs but mark them so you know the difference.
If you only have one or 2 cold eggs you NEED to pop in incubator, (he-he-ha-ha,) then mark them separate again, and put them far as possible from the other eggs. (I would not add cold eggs with warmed eggs after day 3-5.)
I hope this helps.
If you plan ahead and have 2 separate incubators this can be done. If you can keep them separate.
If you cannot keep them separate say, if you only have one good incubator, see about making a DIY incubator that can just heat up the eggs a day or so, then you can put warm eggs in with the other eggs but mark them so you know the difference.
If you only have one or 2 cold eggs you NEED to pop in incubator, (he-he-ha-ha,) then mark them separate again, and put them far as possible from the other eggs. (I would not add cold eggs with warmed eggs after day 3-5.)
I hope this helps.