Hang out one's shingle

From Fresh Dictionary

English

Verb phrase

to hang out one's shingle

1. ((idiomatic{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}})) to open an office or business

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