How does the repair begin in the apartment?

Finally, we have forced money, took a vacation at work and were going to do repairs. And at this stage they stopped and thought: “And why, in fact, start? What to do and whom to ask about it?». Today we will try to clarify a few questions that excite us on this topic in order to have some idea where to start. To know how to prepare for repairs correctly, so that later this whole process will pass unhindered and more or less smooth. So that we do not experience discomfort for years from what we have not calculated with money and could not bring something to a logical conclusion, or did not organize the right work, and there are many flaws from different brigades of the Shabashnikov.