Performing pulley techniques on a skateboard, such as grinding and sliding, requires practice, balance, and an understanding of how to manipulate your board and body. Here are the basic steps to perform these tricks:

Grinding:

1. Approach the rail or ledge at a slight angle, with enough speed to carry you through the grind.
2. As you approach the rail, crouch down and center your weight over the board.
3. Ollie or pop the board to lift it off the ground and position it onto the rail or ledge.
4. As your board makes contact with the rail or ledge, use your body and leg muscles to maintain balance and stability.
5. Slide along the rail or ledge, keeping your weight centered and distributing it evenly between your feet.
6. To dismount the grind, shift your weight slightly towards the direction you want to exit, and ollie or pop off the rail or ledge.

Slides:

1. Approach the surface you want to slide on, such as a curb or box, at a moderate speed.
2. As you reach the edge of the surface, crouch down and prepare to slide.
3. Ollie or pop the board to lift it off the ground and position it onto the surface.
4. As your board makes contact with the surface, shift your weight towards your toes or heels, depending on the type of slide you want to perform.
5. Use your body and leg muscles to maintain balance and control throughout the slide.
6. To dismount the slide, shift your weight back towards the center of the board, and prepare to land smoothly.

Remember, mastering pulley techniques takes practice, balance, and control. Start by practicing on low ledges or curbs and gradually progress to higher or longer rails and surfaces. Always wear proper protective gear, including a helmet, knee pads, elbow pads, and wrist guards, to ensure your safety while practicing these tricks. It's important to practice in a controlled environment and be mindful of your surroundings and the condition of the surfaces you're riding on. With dedication and practice, you'll be able to perform stylish and smooth grinds and slides on your skateboard.