BekZ - our DS will be 21 months when bub is born, and I've been wondering the same thing! Some things I have in mind:

How am I going to be able to bf with a toddler around?
I'm planning on reading to him or feeding him whilst bub gets fed. He loves his books, so I'm hoping this will work! LOL

How can I keep DD occupied and happy whilst attending to nb?
Could you get her to help somehow? I've found the best way to stop DS being a pain while I'm in the kitchen is to get him to help. He's very good at stacking and unstacking the dishwasher!

How can I get all the house works done?(I am a house tidy freak)
Hire a cleaner for a few weeks? Hopefully the nb will sleep a lot in the early days. Does your DD still have a day sleep? DS still has 1 to 2 sleeps a day (depends on the day) so I'll be making the most of that.

How am I ever going to get out of the house for appointments?
Just repack the nappy bag straight after you come home ready for the next outing, then you just get everyone dressed and go

How do I establish a good workable routine?
No idea! LOL - I'm not a routine girl, so can't help with that one.

How am I going to get dinner on the table?
Do some cooking now and freeze it or save up some dosh for some takeaway, or teach your DH to cook!

Of course, I'm not experienced with this yet.. just some ideas floating around my head at the moment. I'm hoping things will just come together after a few weeks. Of course, we can't predict the toddler's reaction to the baby.. everything could hinge on that!

All the best with it, and try not to stress.. everyone else seems to manage, I'm sure we can too