Before raising the vehicle with a jack, it is necessary to place chocks under the wheels or otherwise block them to prevent the vehicle from rolling. After raising the car to the required height using a jack, it is necessary to place it on supports, placing them in specially designated places. Only after this can you begin work. All the above works should be carried out on a flat surface.
When removing heavy components such as an engine or gearbox, be careful not to lose balance or drop the component. In addition, do not allow the unit to hit adjacent parts, especially the brake lines and the master cylinder.