I would select a co-worker that seems to work quickly and smartly and tell them just that. Then ask him or her to show you how he or she takes care of somebody you believe needs two people (set aside for a moment whether the care plan specifies 1, 1-2, or 2 person assist). It goes like this, "Wow, I can't believe how quickly you get everything done. You really know your stuff. You seem to be one of the best CNAs here. Can you show me how I can do X?" Make sure X is something that takes a significant amount of time so what he or she can teach you really makes a difference in speeding up your shift.