The ability to perform intravenous (IV) cannulation is something medical students, nursing students and other healthcare professionals are required to learn. This video aims to give you an idea of what's required in your exam (OSCE). You should not perform this procedure on a patient without undergoing the necessary training from your university or employer. This video is not a substitute for professional clinical training and may differ from your local medical school or hospital guidelines.
If you have patient with hard skin its helpful to puncture vein in 60° then putting it immediately in 30° :) and don't be afraid of bigger cannulas!