This varies greatly from material to material and from job to job. If you decide to use real stone, manufactured stone, or stucco there is a quite a bit of labor and time involved, as well as a variety of skills necessary, which would require a contractor to be hired. If you choose a sheet product, a lap siding, or simulated siding there is much less knowledge needed and sometimes significantly less time and effort required to apply these products. You should assess if you have the skills necessary to perform this type of project as well as if you have the time and what the cost difference will be between hiring a contractor and completing the project yourself. Some jobs are definitely best left to professionals. Many jobs entail doing work on portions of your structure that may be hazardous to work on.
