Turn 1: This mission is a simple fling and kami. You need to do a quick hand motion to start off, since you want your arrow hand free the moment you get the rope crate. I'm pressing tab/enter quickly to switch worms and jump, then putting my left hand on f8 and space to select/shoot rope, keeping my right hand free. The fling just needs to be done with an angle and a bit less than full power. And you could always rope across slowly if you had a really good run going.
The kami spot is easy to judge by eye, but for precision, it's on top of the wooden sign, about where your worm touches the last step as you're walking left to right (if you imagine the top of the sign as a series of pixel steps).