DH and I have had a lot of great suggestions for toilet training our 3 year old daughter and she is very keen on following me to toilet and copying me but she will absolutely NOT sit down on the toilet. We have a step for her, a special cover for it (so she doesn't fall in!) but she seems scared of it. We have never forced her on it so i'm not sure why she's so scared. She loves to flush it so its not the noise.
Also, lately she's been fighting us changing her nappy standing up. They started doing this at her special ASD nursery and so we started doing it too but she fights us now and drops down to the floor spread eagled waiting for her royal change 
On the flip side she seems sick of nappies and has been going to her 'poo place' for over 6 months when she feels the need upon her so she seems ready by most standards. She will also sometimes tell us she's done an poo although never when she's had a wee.
I'd be interested to hear what tricks you guys have used to encourage and finally get them to use the toilet or at least sit on it!