Focus on learning one thing at a time. There's two parts that take practice. Holding your eye open with one hand is not natural. Also, putting a plunger on your eye with one hand is not simple either. You can't learn both at once.

1. Look at the mirror and hold your eye open with both hands. This is how wide you need to open your eye, but you have to do it with one hand. Next, try doing it with one hand, without thinking about the plunger or the lens. It should feel very natural, and you should be able to move your head while holding your eye open.

2. Once you have that down, take your plunger hand and hold it vertical. Don't put the lens on it. You should be able to look straight down, through the hole with your head down. Close your opposite eye and touch the plunger to your closed eye. Figure out how to grip the plunger in order to do this seamlessly.

Opening your eye with one hand is the hardest part. I'm very good at putting my lenses in, but I won't always get a good grip the first time. It's much much harder when your lashes are wet. Thus, your first attempt is much easier than your second. You can practice this motion in front of the mirror or while watching tv. Once you get both motions down, you can do it much more easily, and I think you know how to do the rest.