It's all down to the individual - go with what feels best for you. At the start it is intensive. I would imagine you're in the circuit at the mo which is tiring. Go at your own pace - once you're on navs you'll be a bit more relaxed and may feel able to do more. And if you haven't done so learn the airborne checks inside out. It will relieve your workload, especially in the circuit.
All the best
SK