After you finish with the PCB design, you’d like to build prototypes before you decide to run the production in large quantities. Many software development programs such as PCB design and industrial design software have integrated simulation capabilities. Performing a simulation allows to minimize the amount of defects in the design before the first prototype is constructed.
In case you are designing a complicated product, consider modular design where all the main functions can be found in some modules. On your test, you can replace modules that usually do not meet design limitations. Spinning individual modules will be faster and much more economical than rotating the entire design.
Based on the complexity of the design, you can consider manual assembly of PCB components to save costs. However, for medium and large complexity, this process is usually extremely time-consuming, especially if you want to build a few prototypes. Therefore, it seems reasonable to consider the contract manufacturer for your installation.
When production is started in small quantities, development cost is usually dominated by the entire cost of developing a PCB prototype. When you are looking for subcontractors, it is desirable to choose a supplier specializing in prototype design to reduce costs. PCB prototype manufacturers typically combine panels of different customers, effectively dividing the cost of setting up among several customers.