Many wonderful composition for the soloists is often written with either the orchestra or the piano part. In order to show your targeted audience your stylistic understanding of the entire composition you often need to hire a piano accompanist and rehearse accordingly . This is cheaper than hiring an orchestra for sure.
in both Sydney and Melbourne, I have accompanied many professional singers, instrumentalists and and Eisteddfod winners and there had been great feedback.
Since I am trained as a performer ( both of my degrees include performance components) I can easily guide you with the appropriate interpretation that will marry the orchestral or piano part so well that the adjudicator or audience will impress .
If you are doing exam . I am also the best choice for your consideration.