The installation of a commercial mast is very simple. For posts of 15 and 20 feet in diameter, it is possible to do the installation yourself. For taller masts, a professional installer would do the job. This is because a large amount of concrete is likely to create a legitimate balance for large flag poles and a crane can be expected to lift the tree into the socket on the ground.
To install without assistance you will need a few tools to take responsibility eg b. Concrete, mixing and dredging tools, wood and gravel discs. If you think this is too much for you, you can call your layman to set up your post for you.
As with other businesses, there are specialist vendors here, and you should consider the consequences of a lower pole eventually collapsing. It will usually be insufficiently attached or more likely the wall thickness is insufficient for the activity.