Well.. let's put it this way.. chicken chicks are very, very easy to raise, in fact they are "hard to kill".
Peachicks? Not as easy, but maybe that's unfair due to chickens being so hard to kill. With the brooder conditions being good or perfect, they can be fairly easy. If not perfect, they can seem 'extremely frail/hard to raise'.
If you have a very large brooder with high sides-peachicks fly shockingly very well, even at just few days old.. at just one or two weeks old they can already fly 4 feet high easily.. they also love flying, so a low top brooder will not be too good to them. A very common loss in young peachicks with first time owners is due to the peachick flying out of the brooder and either getting chilled or killed by the family dog/cat because they don't realize how well they can fly.
They also need a hot/hotter spot than chicks do.. but also need warm and cool spots to retreat to. Another reason to give them bigger brooders..
Peachicks also form much stronger attachments to their mothers.. which makes it a mess taking them from a hen past several days old.. but this same trait makes them very endearing pets if you play and cuddle with them(but they'll cry LOUD if you leave) and grow up into charming youngsters and adults(mind you some hand raised adult males attack people Not all do though). Poultry including peafowl do not have a strong sense of smell and smell plays no part in bonding. For them it's vocals and visuals that far more important.
I worry a bit, but in the end.. if you are able to provide a large brooder with a secure top and pay a good bit of attention to the room and brooder temps etc, you can raise the peachicks.. do not think they will be easy as chicks though. I can practically simply toss day old chicks in a brooder and just put in food and water daily and that's it.. they'll thrive.. peachicks, I fuss over the whole room (and shed) and pretty much check on the brooder every few hours at least- day and night. I often get pretty tired from this but in the end I lose very few of them(usually either just one or none at all each season).
The above is why I love having large pen setups designed for just a single hen and her foster peachicks. The peachicks grow up very healthy, strong etc.. but mostly gives me peace of mind and less stress fussing over them. Mind you I also alter the pens to make sure the peachicks cannot accidentally fly out and can't get back in.. so I have one inch wire all the way up the sides and tops too. At 2-3 weeks old they still are small enough to go through chain link.. and at this age they easily can fly 4-6 feet high so if the one inch is only 3-4 feet high along the bottom, they can and do fly through the chain link and are unable to get back in due to that one inch wire..