Here is a video of us making our hills. They were already prehilled and are about 125 feet long.
We pull driptape (irrigation) at the same time we make the bed (that is the big black thing on the tractor) and we mark rows at the same time to. By marking rows it makes it easier to seed or transplant straight without pulling string (which is hard to do straight when your land is not flat.)
In case you wonder, I am standing on the hiller as we do the rows. That way I can cut the irrigation tape at the end of the row and start it at the beginning. Enjoy!