Modeling and simulation(M&S) engineering is one of the most challenging areas that have to deal with problems from multiple domains. Hence, in the M&S field, the various domain experts and the M&S experts often work together to build a simulator. Yet, in some domains like military, cooperation has been limited because of the security policies in domains. Therefore, the domain experts in such fields are required to have M&S knowledge on the top of their domain knowledge to build simulation models by themselves. This paper describes our experience of developing a simple warship simulator and assisting such domain experts to obtain the M&S knowledge using Warship Simulator Project. From the experience of the project, we found that the DEVS formalism is easy to learn, and it is suitable for developing a simulator easily with implementation of DEVS formalism.