It completely depends- if you can get someone to hold the rabbit for you then it will be a lot easier.
I myself have a very placid old bunny who doesn't care what you do so I just pick up each foot and clip the nails.
In the past however having to deal with more nervous, wriggly bunnies I would sit cross legged on the floor. Face bunny away from you and lean bunny back into your stomach as far as the bunny is comfortable (some hate being on their back, quite understandably). Use your arm around the bun to secure him. The little paws will be accessible and clip clip.
Having said this, though, I trim nails all day every day so I am experienced in trimming nails so find this easy to do by myself, but depending on how confident you are will affect how easily and quickly you get them done.
Remember they have a quick (vein that feeds the nails) running through a certain portion of the nail. White nails are easy as you can see the pinky coloured vein in the nail- clip a few millimetres after the quick stops to cushion the quick. Black nails can be a little more tricky- shining a light underneath them can sometimes help.
Make sure you are always cutting in a downwards motion, not side to side as this can pinch the nail, causing discomfort and the bun to pull away from you.
Your best bet is probably getting a friend to hold bunny until you get more confidence to do it all yourself, which can take some practice!
Happy clipping
Jen