Start off by ensuring that you are prepared in advance. Preparation is one of the most important thing when bonding, little preparation often leads to injuries and decreases the risk of a good bond occuring.
If your buns are indoor buns ensure that you have a room where none of them have been, if you havent got an area you will need to prepare this in advance by cleaning thoroughly. If you have washable floors clean them with a smelly rabbit friendly substance such as a 50:50 water :vinegar solution, it is pongy but gets rids of rabbits smells, anything that your rabbits will have contact with such as skirtingboards, legs of tables / chairs etc can be washed down as well. Soft furnishings are more of a problem, if they can be washed / hung out / dry cleaned etc do this otherwise leave sprinkle with bicard to try and deodorise them, then leave for a few weeks for the smells to decrease.
If your rabbits are outside rabbits you will need an indoor room where neither have been before, if one or more have been there clean as above. Ensure that the area is somewhere you can turn the heating down and that you can supervise them constantly from if necessary.
Ensure that you plan a long weekend where you or someone else can be with them if required for at least 48 hours ideally longer if necessary. Have somewhere you can sleep in easy reach of them. Ensure that you have no little errands you must run. Work out a plan so that someone can stay with them if required after the 48 hour period of they still need supervising. If you cannot do this leave it until you have the time to do the bonding.
Have something to use such as a pen which you can use to slowly increase the space you give the rabbits, ideally start off with an area about 4 x 2 foot, leave the space like this for at least 48 hours then SLOWLY increase the space. If there is any nipping, chasing or fighting do not increase the space until they have been settled for at least 48 hours. Any increase in space must be into totally neutral area.
Do not use your hands to separate them if you need to do so, have a broom handy. When rabbits fright they do it with closed eyes and then will just lock on to what ever you offer them ... however protected you are with a coat or with gloves it is highly likely that they will still reach your skin. A broom which is clean and not smelling of rabbits will save you a lot of agony.
Anything you use must be either new or neutralised, I usually start off with very little in the pen as often you get one who is trying to dominate a litter tray or food bowl. If you protect your floors I would avoid using a tray for the first 6 - 12 hours and then see how they are with it, if one dominates it remove it. Food can be sprinkled which gives everyone an opportunity to get it.
All rabbits should be neutered. Whilst babies will settle in quicker and are usually fairly easy to bond in with other rabbits, as they mature they may fall out with their new partner and nasty injuries occur whilst you are not in. This can occur overnight. With mature rabbits it does make bonding easier if they are neutered.
