For producing electronics you can certainly contract out the design and manufacturing of boards. There's countless freelancers and entire contract design compan

For producing electronics you can certainly contract out the design and manufacturing of boards. There's countless freelancers and entire contract design companies. From there, it depends heavily on the number of units you want to produce. For a couple hundred units per year, you're assembling things by hand. PCBs are shipped in complete, you put them in the case, test, package, ship. Cases will probably be 3D printed, which you can either do at home or contract out to a 3D print company. Designs can also be contracted out. In the low thousands you'll be looking at having things hand assembled in a factory somewhere. Your housings and components are shipped to the assembly house, they do the manual labor of assembly, programming, and testing depending on how much you spend. At this level, injection molded housings become more economical than printed, at the cost of a big upfront investment. From there, you're into industrial quantities and I personally don't know how to get there, so good luck! If you're really serious and have the money to front it, find a design consultancy. Their entire business is assembling and renting teams of skilled engineers to solve these problems for you. Or, build a startup company and hire a couple of nerds in a garage. The root of your question is "how do I do this thing without all the skills?" and the answer is to just hire people with skills.