Learning how to clean with great technique takes a lot of practice. Seated KB Cleans is a good starting point.
Most people struggle with the flipping movement that requires you to get your elbows up and under the bar. If you begin working on the technique sitting down you can concentrate on it without having to worry about using your legs. Once you master it, moving on to KB Swing Cleans (standing), KB Cleans, and then Cleans with a barbell, is a good idea.