OK, so have just done the first day of an attempt to train DD, who has just turned 3. There's a few things I don't quite understand, but looking through guides and googling is bringing back so much stuff I can't work out an answer.
1 - One of the reasons we're so late starting is that we've been waiting for DD to show any of the signs of recognition but she never has. Doesn't ask for a dirty nappy to be changed, doesn't poo at regular times, hasn't shown an interest in pants or the potty. Do all kids show those signs at some point? By not showing any signs, is she not ready?
2 - She doesn't poo at regular times. I'm really confused how this works as I read so much about kids training for poos later than wees, but if she doesn't do a poo at the same time then are we just going to be cleaning poo from her pants? 
3 - Sitting on the potty isn't interesting her. Today has been a battle with a lot of fighting against the potty (or toilet, doesn't want either) and wees on the floor. Everything I read says to put them on the toilet every 15/30 mins and get them to try. But she doesn't want to sit, and she doesn't want to try! Looking at books or watching telly is barely tempting her either.
4 - Bribery isn't interesting her either. She's not big on the idea of asking for things to get later (was like this at Christmas/birthday too) so explaining that learning to do this might get her a present doesn't really float her boat.
She knows about peeing in toilets and potties. She watches us go, she understands other kids go, she follows them into the toilet at the CM's - but she's just not bothered about doing it herself.
Sorry this is very long
I'm not expecting an overnight miracle though that would be nice but have no idea whether to persevere at the moment, or give up. And I don't know whether what I've explained above means she's not ready or she's just going to be a bit stubborn over this (which wouldn't surprise me!)