How to avoid over-investing as a starting artist (expert advice)

When starting as a brow artist in the field of PMU and powder brows, one can often incur lots of unnecessary costs that eventually can contribute to failure to become successful. The psychological reasons for this are two-fold: one often seeks to compensate internal security with such investments, or alternatively (often additonally) impress existing and potential clients. Both of those are dangerous forms of rationalizing unnecessary investments. Potential cases where over-investing happens are often the following: getting the expensive machine, purchasing a wide range of pigments, buying expensive photo equipment, taking on fixed costs in the form of rent, or...