hang out one's shingle

/HH AE1 NG AW0 T W AH0 N EH0 S SH IH0 NG G AH0 L/
verb
  1. 1

    To open an office or business, especially in a profession.

    โ€œShe's good enough at fixing vacuum cleaners that she should hang out her shingle and try making some money at it.โ€

Source: https://en.wiktionary.org/wiki/hang%20out%20one's%20shingle