Cheers for the insight folks

oh dear, what have I let myself in for....

Hi guys! I'm starting my PhD in Sept, and although I think I know what to expect I'm really not sure!! did you get any nasty/nice surprises? What don't they tell you before u start!? Also I've been reading a few of the threads on here and I'm getting worried about costs etc., I've secured funding for fees and maintenance but will I be expected to pay for conferences and things myself with my maintenance allowance!? Thanks!