Whether or not you can install your gutters on your own will depend on several factors, including the material, style, and expectations for your home drainage system.
Many people who choose to opt for cheap gutter systems will also attempt to install them on their own. For example, it may be quite possible to install sectional vinyl gutters on your own. However, opting to take this route is often regrettable due to the already short life expectancy for these gutter systems, even with professional installation. Add to this the risk of amateur handy work, and the effort is not worthwhile.
Seamless gutter systems and high-quality materials require professional installation. It is always best to consult a professional before attempting any home improvement project, especially an important job.
A professional can also help assess the condition of the area around the gutter, including the fascia board.