Meditation is all about the trying. "Sucess" is in the attempt itself.
When your mind wanders, don't worry that it wandered. It inevitable will. You can't really stop that. What you can do is notice when it's happening. Then pay attention to the wandering. Why did that thought pop up? Now that I noticed it where does it go. It's like watching what the bus driver does instead of just letting the scenery absorb your attention as it passes by. Or it's like thinking about how a movie was made instead of letting yourself get swept up in the narrative.
Don't stress meditation. Half the point is to just chill.