Too early to specialise?

I’m about to start on my training contract application forms. I was therefore wondering at what stage I should mention what practice area I want to specialise in?

I’m about to start on my training contract application forms. I was therefore wondering at what stage I should mention what practice area I want to specialise in? I’m worried that if I talk about specific practice areas too early firms will think that I’m being inflexible. Also, I’m worried that I don’t know enough about the different practice areas to make an informed decision. Then again, if I don’t highlight certain practice areas will firms think I don’t know where their strengths lie. What’s more are there any practice areas, other than insolvency, which are doing well?