Well, coming out of doing probably one of the harder exams set by the VCAA for Specialist only just two days ago, people around here might say things are a bit harder than they actually are. Cos I'm sure most of us are disheartened with how we went ><'
But anyways, I'm going to tell you what I would've liked someone to have told me if I asked the same question as you are asking now

Specialist is practically as follows, give or take a few things of course:
- Know your geometry. Properties of parallelograms, squares, rectangles, triangles etc. etc
- Vector Proofs mainly consist in working your way around these geometrical facts to prove shapes and sizes.
*I found Vector proofs to be the most challenging in the Vector section, the rest is straight forward.
- Complex Numbers; it's not as bad people say it is I actually enjoyed it the most.
- Circular Functions; pretty safe coming off the bat from Methods. Just a few new rules and functions to remember.
- Differentiation/Anti-differentiation; pretty basic stuff again with a few new techniques and rules added on to the Methods stuff.
- Differential Equations; Probably the hardest for me personally. It was really weird at the start but after a bit of practice it's not that hard to get your head around.
- Kinematics & Dynamics - if you do Physics, this shouldn't be nothing new. Specialist just goes a bit further by adding Frictional Forces and also using vectors when working with Newton's F=ma but no surprises at all

I don't know how much of that would make sense to you or anyone else but hope it does a bit at least ><
Differential equations were probably the hardest going for me in Specialist

But I think that's just me..haven't heard many complain about it before ><