There are many different levels of modding. I recall when I first tried to make 3d starships for the Star Trek Armada game I had a most difficult time wrapping my head around 3d concepts. I tried, failed. Tried some more, failed some more. Eventually, it slowly started to click. I guess what I am trying to say is this, "if you have a passion for 3d modelling or modding in general, keep after it." Also, find forums where you can post your work in progress (WIP), and explain what you are doing and problems you have encountered. There are some very gifted 3d modelers within the FO4 community and I want to think that help is out there if you are willing to ask for it. The phrase "If at first you don't succeed, try, try again" comes to mind. If you have passion and a desire for this type of work, the skills can be learned. Ask yourself questions along the journey, what skills do I need to master to accomplish the goal/project? What do I need to do in order to acquire those skills? Software skills, hardware skills, life skills, math skills etc. Be patient as you follow your passion.