Most of this boils down to what the availability of sunlight at your location is.
Factor 1: How much sunlight does your area get? Try googling "PV potential resource atlas" This will often find either maps or tables for your country that will list the sunlight resouce for a Typical meteorological year. (TMY)
The result of this is usually a number "kWh/Kw installed capacity" for given orientation. Most table I've seen have numbers for vertical, latitude +- 15 degrees, and horizontal. There are ways to adjust for non-south orientations.
Factor 2: Orientation and shading of the mount location. There are apps for smartphones that show the path of the sun at solstice/equinox. Using these you can quickly determine if there is going to be shade on your location at any given time.
Factor 3: Regulations affecting your hookup. Check this carefully, as in some jurisdictions it is effectively impossible to get connected, or there is such a discount applied to the power you add to the grid, that it is not economical. This may also affect how much of it you can do yourself and how much you have to hire done.