Knowing how to use the blender tutorial for your 3D modeling is helpful because you need to know to make the lighting on the design look good. The lighting goes far to help you when you are trying to make your design look better, and you need to be with someone who will help you make the best decisions for the design in your hand. The design that you make cannot be perfect until you have gotten the lighting right, and the blender tutorial saves you so much time that you will never have to worry about not finishing on time.
You are on a deadline that relates to your payment, and you need to have a program that lets you get everything right the first time. You send it off to your client when you are done, and they will be impressed because they see something that looks complete. You need to play with the lighting until you see something that looks realistic. You are trying to turn a 3D model into something that you can see in the real world, and you will enjoy it more every time you finish. That design goes in your portfolio along with your other work, and you will look back and remember that you did such good work.
You will need to use the blender every time you do a new design, and you have to learn that light plays an important part in what you design. The design is not done in the dark, and there is no static light for it. You are using these things to make your life much easier as you do your work, and you need to know that you have options that go outside of the boxy 3D design that you are used to seeing.