Fully parenthesize the expression starting from left to right. During parenthesizing, the operators having higher precedence are first parenthesized.
Move the operators one by one to their left, such that each operator replaces their corresponding left  parenthesis.
The part of the expression, which has been converted into prefix is to be treated as single operand.
Once the expression is converted into prefix form, remove all parenthesis.   _{Your Comment}