Change the subsubsection numbering style

Question

How I can do this with \subsubsection just in this section because I would do just in this section and not in other section of report. It is possible to do this?

This is that I want to do:

\documentclass[12pt]{report}
\usepackage[french]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\begin{document}
\section{Les étapes }
\subsubsection{1) un}
    texte........
\subsubsection{2) deux}
    texte........
\subsubsection{3) trois}
    texte........
\end{document}

Answer 1

Here is a solution, withtitlesec and fmtcount:

\documentclass[12pt, french]{report}
\usepackage[T1]{fontenc}
\usepackage{babel}
\usepackage{fmtcount}
\usepackage{titlesec}
\setcounter{secnumdepth}{4}
\titleformat{\subsubsection}{\normalfont\normalsize\bfseries}{\arabic{subsubsection})}{0.5em}{\numberstring{subsubsection}\enspace}

\begin{document}

\setcounter{chapter}{1}
\section{Les étapes }
\subsubsection{}
    texte........
\subsubsection{}
    texte........
\subsubsection{}
    texte........

\end{document} 

Unrelated: If you have a recent version of LaTeX, you don't have to load inputenc, as [utf8] is nnow the default. Also, it is better to load the language options with the document class, to be sure all language-dependent packages be aware of the current language.