Remember John Cleese's sketch about the ministry of silly walks?.......well......bear with me on this one....
Start on the left side because the bike is leaning toward you, which makes my 'process' easier.
Face towards the side of the saddle from about 3 feet away and pretend you're John Cleese by swinging your right leg up in the air to clear the top of the seat.........Are you with me so far?.......are you shaking your head or laughing at me yet?......perfect
........keep bearing with me......so, your leg has been swung up in the air as high as it can go so it will come straight down again cos it's heavy, right?.......right......so the trick is to land the back of your heal on the far side of the saddle. The saddle will steady and support you a bit while you follow through with your bodyweight going towards the side of the bike, and your right foot will continue down the right side of the bike with your right inseam sliding along the top right edge of the saddle....you will need to hop a little bit toward the bike depending on how far I am away from the bike when you swing up your leg.......and voila!!
.......your're in the driving seat, I mean, saddle.
***Disclaimer alert***
I am fairly tall, so it might not work so well if you're more vertically challenged.
......and for goodness sake, don't swing the other leg by mistake, or you'll end up facing the wrong way