How to hatch eggs under a broody hen?

firstly the other hens should not attack chicks as long as there is enough room for them not to get trampled ,secondly what do the people who sent the eggs say about how long they can last ?s there a guarantee ? just put the eggs strait under your broody hen she will do the rest a hen will have a better success rate than the best incubators however you are just as likely to get cockerels instead of hens god luck hope all is well