Finish the base before the rabbit arrives
Settling starts before the carrier opens. Have the enclosure or pen completely ready: hay piled generously beside and inside the litter tray, water in a heavy bowl or bottle the rabbit already knows how to use if you can manage both, a hide with an entrance and an exit so he never feels cornered inside it, and flooring with grip rather than a slippery surface he has to brace on. Put the base somewhere quiet, out of through-traffic and away from the television and from doors that bang.
Rabbits are prey animals, and a new home arrives to them as noise, smell, and hands from above. A finished base answers the only questions that matter in the first hour: where to hide, where to eat, and where it is safe to sit still.
The first hours: open the carrier and step back
Place the carrier inside the pen, open its door, and leave. Let the rabbit come out in his own time, even if that takes an hour of sitting motionless in the carrier doorway. Tipping him out or reaching in after him spends trust you have not earned yet. Check from a distance that he has found the hay and water, and top up hay quietly when he is at the far end of the pen rather than reaching over him.
Eating is the health check of the first day. A rabbit who nibbles hay within the first hours and produces droppings in the tray is settling. A rabbit who has not eaten at all as the day wears on needs a call to a veterinarian for advice, because rabbits should not go long stretches without food moving through them.
Meeting you at floor level
Sit or lie on the floor outside, then inside, the pen with a book, and let curiosity do the work. Offer a herb leaf from fingers rested flat on the floor and let him take it and retreat; retreat is part of the conversation, not a failure of it. Avoid lifting in the first days unless health checks demand it. Most rabbits dislike being raised off the ground, and a rabbit who learns that your hands mean being grabbed will keep his distance for weeks.
Keep children and resident pets on the other side of a barrier for these first meetings, watching quietly. One calm observer at a time teaches the rabbit that people near the pen are predictable.
Expanding slowly, in the right order
Only widen free-roam space once the base is clearly home: droppings mostly in the tray, relaxed flopped sleeping in the open, and approaches to you without prompting. Add one room, rabbit-proofed for cables and gaps behind furniture, and keep the base door open so he can retreat to it. New rooms, new people, and meeting resident animals are three separate introductions, spread across days, not one exciting evening.
Keep feed changes equally gradual. Feed what he was eating before he came to you, even if you plan a better diet, and transition over many days; a house move plus a sudden new diet is a common recipe for a digestive upset in a new rabbit.
With KinsLe Family Sharing, this rabbit's arrival diet, settling notes, and handling rules sit on a profile the whole household can read, so everyone follows the same floor-level approach instead of each person trying a different welcome.