handling sessions comes when hes 2 months old, their behavioral mechanism for taming a mynah is more complex than your parrot or any other parrot, parrots are fully bred meant for captivity over the years, mynahs are still wild and still circumvent on the need of pre-natural upbrigning
i hope there's no misunderstanding but the means of taming a mynah is much more difficult than most birds, because their sense of belonging is only due to specific species type mindset, not with human bonding.
also there is not many means of foods to use as a means of training and handling
most mynahs fall for grapes others different, so the allowance of training comes at a slip margin of finding the food he likes, and him responding to it