Working for a management consultancy- what to know/advice?

[Desperate2012]

Hi everyone- not sure where to put this, I'm looking for some advice!

I'm (for various very boring reasons) having to look around the market for a new job despite not being at risk of redundancy etc. as I want a pay rise!

I'm thinking of applying to mcKinsey and Simon-Kucher. But I'm a bit concerned about juggling that job and a 3 year old, so does anyone do this and how!?!?

Also, any advice for applications? Do they use recruiters (everyone in my industry does, hence the question).