Paver sand process question

While doing the sand process for pavers.
I see on you tube that people use 3/4 or 1 inch pipe on the edges. Load sand use 2x4 to scrape level.
Basic and dumb questions. Just trying to be prepared.
How do you keep the pipe from moving?
I have 26' pass. Do i use 2 8' long pipes?Once i get to 8 feet lift pipe up move on down?
Or do i need 26' of pipe length times 2?

Thank you