I'll be the first to say I know little to none about bantams only that they're cute and mini versions of big chickens. lol
With that stated.
Are they hard to raise? Is there anything that needs to be done special for them?
Do's and don't's?
I've had some bantams, with no trouble. Mine included Easter Egger bantams, Cornish bantams, Old English Game bantams, Plymouth Rock Bantams, and maybe a few others that I've forgotten.
I have avoided Silkies, because they do have some special needs (can't see well with the crest, can't fly with the different feathers)
I have a personal preference for breeds with no crests and no feathers on the feet, so I have only had bantams that have clean legs and uncrested heads.
The bin was a complete mix of assorted bantams. So who knows what I would have ended up with. lol We don't get cold winters as much as intense heat. Our standard cochins, get hot fast. So need lighter feathered birds for us.
It's possible to recognize certain traits even in chicks. Sometimes that is enough to tell the breed, or at least make a good guess.
Chicks with fuzzy feet will grow up to have feathered feet. (Silkies, Cochins, Brahmas, d'Uccles, maybe a few others)
Chicks with a lump on top of their head will grow up to have a crest on the head (usually Silkies or maybe Polish.)
Chicks with black skin are usually Silkies.
If you look up comb types for various breeds, you can sometimes recognize those in the chicks. Rose combs are flat and are wider than most other combs (Sebrights, Wyandottes, d'Anvers). Single combs are skinny little things with serrated tops, that may stand up or may flop sideways (Old English Game, Japanese, Cochin, d'Uccle, occasionally appears from any of the rose comb types as well). Pea combs are in-between those two in width, and otherwise not too noticeable (Brahma, Cornish, many Easter Eggers).
Some chicks have distinctive coloring that can be recognized. Some others can easily be mistaken for each other (example: a plain yellow chick might grow up to be a White Cochin, a White Japanes, a White Old English Game, a white Easter Egger, or several other options.)