I flip them on their back, holding them securely so fright is not an issue and make sure they are calm. This is a regular event for them so they are not freaked by it.
I train ALL my pet people to do this as well. Playing with bunny feet helps them to chill out. I also remind them to get them used to the sound of the clipper in action. (I really like that spaghetti idea and therefore may encourage that).
I do my first nail trim at three months, some folks like to do it sooner.
Then it happens every 4-6 weeks thereafter, though I tell my pet people to do it monthly and NOT TO FORGET the small one on the front feet as it will curl in and hurt the bunny foot pad.
the advantage to doing it monthly is
1. it's a regular event and therefore doesn't get forgotten
2. it makes the job so much easier as you just have to take a little bit off.
3. since it is done regularly it keeps nails short which helps to prevent ripping or tearing from caught nails.
How to do it
2. get set up: nail trimmers - I use cat trimmers after 6 months of age. For small rabbits toe nail clippers for people will work well for their whole life. Chair or floor area.
3. flour, cornstarch or styptic powder to use as a clotting agent.
4. blanket if needed to hold bunny and keep bunny calm (I tuck rabbits head under my arm/against body and that keeps them very calm. You can always cover their head. :)