Never be afraid to ask for help. It's better to double check your work and ensure that your design, calculations or assignment work is correct and works properly before moving forward. This will help avoid any minor mistakes that could potentially turn into major issue that could cost the company a lot of time and money. Even if you make a mistake, it is all a learning experience and you'll know the right way to do things for the future. On the other hand, if you are confident in your work and you know that you are right, be sure to stand behind the work that you do, stick up for yourself, and don't allow others to make you second guess yourself!