Even though thousands of houses are built every year, it is still quite a complicated structure overall, as many different trades interlock and nowadays, due to the "fast" construction methods, there is hardly any time buffer left. Therefore, building stress-free is quite difficult. However, if you want as little effort as possible for yourself, a good architect who also takes over the construction management helps. Unfortunately, I have experienced that there are few architects who do both a good planning and good and intensive construction management. Since you rarely change the architect during the construction project, it is not so easy to find someone like that. But if you have one, they can take a lot of work/stress and also decisions off your hands. Ultimately, you should invest a lot of time and familiarize yourself with the subject matter to know what you are deciding about. Even the best architect cannot read minds or foresee the future. How often have I heard: "If I had known it would turn out like this, I wouldn’t have said yes." If you build with a general contractor/general builder, they usually work for themselves and not primarily for the client. Therefore, you basically always need an expert/site supervisor who supports you and possibly also takes stress off you (e.g., coordination, reminders, etc.).
From my point of view, it is best to thoroughly research your contractual partners beforehand, not just on the Internet but through conversations with previous clients. You get a lot of information and especially indications of what to look out for. The same applies to experts. In addition, you should have good chemistry with your contractual partners. It is much easier to discuss things if you like each other, rather than realizing from the very beginning that you are not on the same wavelength. Then the problems are almost pre-programmed, as there is no construction project where nothing goes wrong.