I absolutely identify with this! I also have this terrible habit of doing a tiny bit of a task (e.g. I need a workman so I do the googling, choose one to call, then stop short of actually calling) and then feeling the satisfaction of having done 'something' and forgetting to follow through and do the rest.
If you are indeed like me with these things, I'll give you the bad news at the beginning - my prognosis for your plan lasting the distance is not great - sorry! My great master plans like this have never lasted three weeks, let alone three months.
But I do get things done in dribs and drabs (as I'm sure you do) and over time have got a bit better at 'doing stuff', so let me try and think of something more helpful to contribute 
Well to start - - First off, although this sounds truly lovely, it sounds possibly a bit confusing. Which one is your preferred medium? I always want to find an app that will magically organise me, but in the end I only really get things done once I have written them on paper, so it would be the notepads for me, though I also use iPad calendar reminders to good effect. So perhaps concentrate on one main organisational medium, and one back-up? And make sure you don't spend too much time just transcribing lists and dates from one thing to another.
The getting everything on paper and categorising sounds very helpful - I love that bit. BUT, then I think you need to aggressively edit so as not to thwart yourself with over-ambition.
Daily habits and routines - I would choose just one habit or routine that you really care about improving or starting and shelve all the rest. Work out how you'll improve it/start it/set reminders/reward/motivate yourself etc. and just concentrate on that as a daily thing.
The one-off jobs - I would keep urgent ones on your list, and shelve the rest - they will be urgent one day and then you can tackle them. Or if you get all the urgent ones out the way, THEN you can go back and re-visit them.
Projects which are long-term I would break down into steps, and if any of the first steps are time-sensitive/urgent then keep them on the list. Shelve the rest for now.
Then as soon as the list is complete, get on to doing some of either the most urgent thing on the list, or one of the urgent things that is easiest to tick off. Just get something done so it is started and not just a thing hanging over you.
And every day aim to get something done on the list, or for your daily habit - one thing daily is better than three things all at once then nothing for a week.
Actually having said that, I've just realised I only ever keep that up for a little bit. It's good when it works but sometimes I do think it's better to give myself days off rather than keep pushing for 'action' because I find that I need to let myself off 'action mode' and breathe for a bit before I can get into it again.
So I let myself just be and not be constantly thinking of what I 'must do' for a bit, and then re-start with all the doing when it becomes pressing again. I've come to think that I need on and off periods to function better, rather than trying to be a tick-boxer all the time. Perhaps you're not like this; I suppose the point is to work with your own natural rhythms when you can, and not beat yourself up about that.
Depending on what's on your list, support threads on here can be very good - I've been on a couple for people just needing to get stuff done - writing down a few chores in the morning then reporting back during the day. Also been in and out of the Kondo threads in Housekeeping when I've been on de-cluttering pushes, and meal-planning threads, frugal living threads etc.
Also, I just thought, I found this concept somewhat helpful in helping me be realistic about what I'll get done and what might help me do things. I am absolutely an 'Obliger' by her categorisation - and there are lots of things - particularly things that are for myself, my health and wellbeing etc. - that I just find impossible to motivate myself to do, and I know if I really want to do them I will have to e.g. book swimming lessons instead of waiting for myself to turn into the kind of person who can just take themselves off for a swim every week.
Alright, that's enough from me! I love talking about this kind of shit, so prone to babble on. Good luck with it all 