Here is a possible text to provide to find the most suitable installer:
Hello, I am X and I live in X.
I need to install an X metre X shaped shade sail in my garden / patio / terrace / dehor.
I already have X sails of X anchoring accessories (list all accessories) and I intend to anchor the sail to the wall of the building / by creating a concrete plinth / on the ground / to the ballast base I have. (please specify the material of the ground/wall)
I supply the material required for fixing, including: threaded rods, silicone gun G2000, 300ml cartridge Chimico M-Plus, screws
I also leave an installation guide for further details provided by the site where I purchased the sail: