Hi there
First of all I just wanted to say things arent a mess, these are all things that just seem to happen and you will get through them, you are doing a great job!!
I am a first time mum myself here and can only go on my own experiences, but I have gone through all of what you have listed.
1. The dummy - if it works now to get to sleep then honestly, just go with it. Scarlett used it for about the first three months and she just gradually got to the stage where we put her down and she goes to sleep without it anymore. It really is just a time thing... we would quite often be in and out of her room 4 or 5 times putting it back in and she eventually matured into independant sleep. We kept the same routine and she learnt.
2. Again in the night, we would feed her, in the dark (I just used to open the curtains and use the streetlight) I never spoke a word to her and put her straight back down to sleep and we wouldnt go back in unless she really cried. When I would just pat shush her in her cot and then leave. It is just another thing where routine and consistency pay off. One thing we did do was put her on hungry baby milk.. not because she was guzzling lots of food, but because she was such a tiny baby she could only get a certain amount in her tummy so it was more about a slight thicker consistency to lie on her tummy a bit longer. This worked like a dream.. I dont know what milk you use but we changed from SMA Gold to a pre-biotic milk Aptamil, which suits her digestive system much better.
3. Scarlett seemed to wake at 3.00am for ages, then she went to 4.30 and then back to 2.00am for what seemed like an age!! This was a factor in putting her on thicker milk and she does sleep through now and has done since about 3.5 months. You will know if your lo doesnt need it because they wont seem very interested in it. But if they are still finishing the bottle then you know they need it. There are lots of different ways to wean them off the night feed, but I would say that at the minute you lo will still need those calories.
One thing I did do was just drop the dream feed, Scarlett would only take 1.5/2oz max at this feed and it wasnt worth the tiredness involved in staying up to do it. After a couple of dodgy nights (which involved using the dummy) she soon started going from 7.30pm to 3.00am..
4. Not sure on the extended wake up time.. Scarlett wakes up at 7.00am naturally which is fine.. she may sleep longer as she gets older. You could try treating it as a night feed and giving her a bottle as you would at 3.00am and then putting her straight back down again??
5. 45 minute naps have been a nightmare for me!! Scarlett is four months now and the only way I can get her to sleep for longer than 45 mins during the day is putting her in her pram.. for some reason i think the enclosed space just appeals to her and it works..!! I still use independant sleep, no rocking etc, but it really is a developmental thing and one of those things you do just have to ride out..But it will happen!! Scarlett didnt respond to pat/shush at all... as soon as I go into her room she is all smiles and is wide awake as she thinks its playtime..
Anyway, you are doing just brilliantly... everything you have said is just perfectly normal. I found that I had to just take step back and take each day as it comes before I turned into neurotic first time mummy!!
Let me know how you get on!
Take care
Lizzie