Do not let a salesperson pressure you into purchasing solar panels. A solar energy system is an important investment and you should take the time to compare your different options. If a vendor feels the need to pressure you, they might not be confident about the quality of their products.
See https://diynewman.wordpress.com/2016/07/24/how-to-install-solar-panels-yourself-for-4k-diy-7kw/ for more details. This is how I installed a 7 kilowatt solar …
Using the energy of the sun is a clean way to power the things we use. It's also sustainable as the energy never runs out. One hopes that technology will continue to progress so that everyone can use this energy. For now, you're planning to use it yourself, and that is a step in the right direction.
Try getting recommendations for solar energy home equipment. If you have loved ones or colleagues that have solar energy at home, ask them to provide details of their experience or any issues they've been through with their system. It's important to consider other opinions on what you should or should not do.