Most panorama heads have these preset nob positions that give haptic feedback when you turn them. You can select different angles per rotation you are going for. Makes it relatively simple yet there are not so perfect so you will have to practice a bit. Sometimes you see that the angle is not perfect. Especially when you have 180° you will see easily when it's off by 2° already. So what I usually do is; I start on the upside down position then use the internal lever from the camera display and make the camera come back to the normal position where I know it is coming back perfectly horizontal. So backward choreography.