Lock down day 23 some say with guineas at day 20 because they can start hat hatching at day 25. Some will tell you to dry incubate and others will agree with the 60 percent humidity.. incubate at 99.5...what type of incubator do you have? I have only incubated eggs once so I am no way near an authority on it. I know the eggs I incubated had a range of problems I have promised myself a better incubator than the little giant Styrofoam one next year.. Out of 14 eggs 10 successfully hatched 9 assisted 1 on it's own. Study incubation and study more there are several articles here that are very informative. My baby girl sat her eggs through our flood last night .. guineas are amazing birds.