The important thing is not the sequence. You can adjust the valves in any order that you want. They give you that sequence "guideline" to help you get through the process as quickly as possible.
But, the important thing is that you adjust the valve clearance, or "lash" as it's sometimes called, with the valve completely closed. And, when the engine is at TDC or Top Dead Center of the COMPRESSION stroke, both the intake and the exhaust valves are fully and reliably closed. Having the valves fully closed will result in the rocker arm not touching the valve stem. You will be able to wiggle it a bit with your fingers as there is no contact between the rocker and stem and, thus, the clearance will be at it's maximum between the two. This is the position you will want each valve to be in before beginning adjustment.
It's that simple.
So, if the sequence instructions have you confused or, if you step away from the job for a moment and forget your place when you get back, just know that if you make sure the valve you're working on is completely closed, you can safely obtain a good adjustment.
Although, I would recommend marking each one after you have it adjusted to your satisfaction. That way, if you do get a bit mixed up, you will know which ones are done and which ones still need adjusting. That way, you are sure to get them all and not miss any.
Good luck.