The riskiest time in a ladder stand is when you get to the top of the ladder and climb onto the platform. Depending on the stand, there may not be a lot to grab onto. I've always been very deliberate when I do it, keeping three limbs in contact with the stand, like rock climbing.
Dress for the weather.
Pull your gear up with a rope once you're in the stand.
Carry a bottle to piss in.
If you drop something, don't try to catch it.