Could someone explain what the main responsibilities are of an instrumentation engineer who works on systems in engineering design?

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I have been working in instrument design for several years now. There may be other engineers like me who still have some confusion regarding the work involved in developing systems. Firstly, in earlier years, this type of work was usually handled by the person in charge of instrumentation for a project; if such a person was not available, then there was no opportunity to get involved in these tasks. Secondly, nowadays some project owners prefer to take care of the system development themselves. Thirdly, this part of the work involves working with intermediate files from the DCS manufacturers, and these files are not ultimately among those that need to be published as part of the project, which makes it somewhat difficult to learn on one’s own. All those who hope that an experienced senior engineer or an engineer from a DCS manufacturer working in collaboration with an engineering company can explain, in chronological order, the main tasks involved in system development. For example, what is the purpose of the DCS kickoff meeting, what are the files exchanged with the manufacturer, what is the general content of those files, and what are the main tasks during the FAT phase conducted at the manufacturer’s site, and so on