After having a complete look of your surroundings, including risks/hazards, check the extent of harm any kind of accident in that particular area can cause you. This is to calculate the amount of risk involved with the work. Always note that the amount of risk involved with any job on ship is always greater than what you would have calculated. Also, if you are suspicious that a particular procedure involved in the job might lead to an unfavourable outcome, stop right there. Make sure you weigh your doubts properly before commencing the job.