Right-handed, mount and dismount from the left, swinging the leg over the back of the bike.
I seem to remember mounting from the right occasionally when the kerb has been the other side (abroad), but aren't certain.
I will occasionally mount (similarly from the left) by scooting, or even just stepping up onto a raised pedal. I can't help but feel that
@robgul's received wisdom is incorrect - I can't see any extra strain on a light frame over what climbing out of the saddle wou
My cousin gave me a Tacx turbo trainer recently. I hadn't allowed for the fact that it holds the bike 4 or 5 cm off the floor. When I came to dismount I had a similar problem to that of dismounting onto a lower than expected kerb/pavement. I started to topple over, taking the TT with me.
Someone broke their hip on the Cheltenham 300k a while back like that - stopped in the dark next to a pothole they hadn't seen, and toppled over when the ground was further down than expected
To dismount, I pull the ripcord. The parachute deploys and plucks me rearwards off the saddle and deposits me on my arse in the road.
There's always the old fixed wheel dismount method - let go of the handlebars, sit back, stiffen the leg and allow the crank to raise you out of the saddle, then step down behind the bike and catch the saddle before the bike departs on its own (doesn't work with a saddlebag).