Mine are flemish giants so once full grown they are about 22-25lbs they are too large to cradle like my new zealands (which again if not handled from birth will kick as well... but all my hand raised babies do fine)
So I sit in a chair and hold the scruff of the neck and hold the rump with my other hand and I flip them away from me with their legs pointing out so if they do kick I don't get gouged. after a few kicks they tend to calm down since they are used to being held but just not in that position... then I can "inspect them and such and they usually are fine once they are freeze up... if I hold them there for a while they do eventually relax and calm down but I never really have need too... I've only had to flip a few adults ever anyhow...
Almost all babies I've bought and flipped to check for sex will kick because they are not used to having this done... not many "breeders" will handle kits daily since they have a few litters going at any one time... I have 3 kiddos that really help with socializing all my baby buns... so they do pretty well when flipped as long as they are used to being flipped and held a lot...
It also may depend on the breed as well... some breeds are just more high strung than others... my new zealands are much more jumpy and less friendly than the flemish... Once they are grown I don't even let the kids handle the new zealands because they can decide to kick out of the blue for any old reason... The flemish don't spook half as bad and even though they are almost 2 times the size of the new zealands I have no issues with the kiddos holding them...
So it's not always due to handling techniques some buns are just jumpier than others... sorta like dogs... some just lazy around while others bounce off the walls...