mustrunmore, looks like you got good tips from others on this thread.
The only thing I wanted to say, and this is the big thing I learnt as an initially-reluctant-but-now-loving-it working mum, is not to be rigid about childcare concerns. You know, things like the child must be speaking before nursery, the child is being raised by strangers and will not know me, the child must be over 2/3, it will be so chaotic and the child won't know whether he/she is coming or going.
The fact is, until you try it, you don't know how your dcs will take to it. And you might be very pleasantly surprised (I was, twice). If your dcs hate it (as a mother, you WILL know), then change to another arrangement. But don't organise your working/home life around what you THINK your child wants. Because very often, children are actually a lot more adaptable than you give them credit for. Your dcs will also pick up on your positive attitude, and vice versa.
Each child is an individual.
To me, guilt is no friend. You have to work, bottomline, don't need to make things any more difficult for yourself.