Started with the Vol1 QoS section yesterday. It is quite massive, around 80 labs so while take some time to do them all. In the beginning it is mostly legacy stuff but still the newwer stuff is based on this so it never hurts to know the old way of doing things. It also gives us some perspective on history.
I think my plan while doing QoS will be to do as many QoS labs I can and leave one day for doing a Vol3 lab. That way I will still get some practice on the core technologies.