Oh bless you, MummyN.
I think that's why I was so close to my girl, because I was with her all day, every day, did all the training etc. We learnt it all together !
I think it must be a man thing with the getting angry with the accidents. I have lost count of the number of times my DH whinges about the wee, and I just say "look, if you get to 80-odd and can't make it to the loo in time, no-one will bloody tell you off". I have cleared up more dog wee and poo than I care to remember, and shall be doing it for years more ! That's what gets me, they whine about the mess, but who clears it up !
I completely understand how you feel about not even thinking about another dog yet. I was just like you, for the best part of 3 months. When my girl died I swore that no way was I ever having another female, and no way was I going to get as attached. Funny how time changes things...
I don't know if it has just 'come' at the right time, but we knew that we didn't want another of the current breed we have, and we knew what breed we wanted. Having spent the past couple of months doing loads of research and talking to breeders, owners, etc, buying as many breed books as I could, I have had a phone call today to tell me there is a pup for me if I would like. After all the discussions, I have decided that against all my initial feelings, we will be the proud owners of a female in about 9 weeks !
I am nervous, excited, and terrified ! I have also decided that she will never be called certain nicknames, as they belonged to my old girl, daft as that may sound.
It's a bit weird too...my girl's birthday was the 7th of March, and when I initially spoke to the breeder, she mentioned that she had pups due around 6th February...and then thought to myself "bet the pups will be born the 7th"...but I was wrong....my girl died on the 10th September, and the pups were born last Friday, the 10th February ! 5 months exactly since my girl went. I'm a bit weird anyway, but maybe she had sent another girlie to us ? Just a bit "ooooohhhh"
I am convinced that I won't get as attached to the new addition as I was to my girl, that may be because she was my first, I don't know ? But I will love new girlie very much, and if she can fill a little hole in my ol' boy's heart, then all the better. 
I can't tell you when it will feel 'right', you may be having a nose online and a pup will melt your heart, or you will feel that you can allow another one into your home and heart.
I am also doing it for my DCs. We had the dogs before them, so they have never experienced the 'puppy' thing. They don't know for sure that we are getting a pup, I have just said it is a possibility. I just think that at their ages, they are the perfect ages to help with training (and wee/poo cleaning !) and I can't wait for them to experience the joy a puppy brings. And getting older with a dog too, you know ? Having said that, I am setting them up for a fall aren't I ? We are on a bereaved thread ! Oops...
Take your time, MummyN. You will know when the time is right, if ever. In the meantime, if you do want to chat, you can always pm me, if you want. I don't think anyone can tell you 'how' to grieve, or 'get over' your loss. You do really just have to do it minute by minute, hour by hour, day by day.
I do know how you are feeling, and I feel for you. Just be reassured that one day you will wake up and feel a bit better, and maybe even think with relief, "yes, no wee to clear up". Then you go a bit mad like me, and think "hmm, a pup would be nice, I'll start the whole cycle again". 
xxx