Unfortunately holding somewhere to run a QRH checklist isn't always an option. Can't do that with the single engine before landing checklist, you're not putting the gear down until you want to descend, because at that point you won't have a choice. I usually have the QRH on my lap with the approach plates on the floor or the glareshield. l2flare had it right, there is no optimal way to manage it all, you just do what works for you.