The only reason my bunny was available to bring home from where I got him was because he'd started to develop a 'bad' attitude, and they couldn't take the chance of breeding him and mix that into a show rabbit strain. When I went to see him he was very grumpy at people even standing near his hutch, however, when it was my turn to pick him up I put the back of my hand to where the hutch door had been, he initially grunted but then curiously came to sniff my hand and let me pick him up.
I can't say he's the perfect rabbit, he still has an attitude problem occassionally, but this is just him being territorial to other people besides myself, he's is hwoever really good with kids.
I think the best approach would be softly and slowly. Your bun won't necessarily stop being grumpy over night, and may always have a grumpy side, but they learn in the long run, as long as things like food are not associated with anything bad.
As for coaxing, have you tried putting some different food or treat in the carrier and walking away? My rabbits have all been fortunate to be able to have all of the garden to play on all of the time, however, sometimes when it's bedtime they like to stay out instead of coming to the shed when they're called, I've found if I go back inside for 10 minutes their curiousity, or even hunger, get's the better of them in the end. :wave:
I've had rabbits for over 8 years and I still have to remind myself that they are prey animals, anyone who know's the characters of rabbits knows they can be very cheeky, clever and outgoing when they're happy and comfortable, it can just take time and effort to get there sometimes. You'll get there
I used the Bachs rescue remedy when introducing two of my rabbits to eachother, and I use it on bonfire night, I couldn't say for certain that it works, but it would seem that way. There's also a remedy called Serene that you can get from Pets at Home that also seemed to take the edge off until they learn that you're not going to hurt them.