also I don’t know how specific things need to be in creating lists. Like “ I want to be more proficient on guitar” is very broad. Don’t know if it needs to be more like “ I want to get faster at knowing note names and locations on guitar neck”?
I am only on chapter 3 so far of the book on audible. Do I need to be further along on the book before I try putting this into action?
I don’t know that I can spend 1-2 hrs a day on this? As someone suggested
I want to be more proficient on guitar is, to me, an Area of Focus. It will then flow into multiple projects. One might be learn note names and locations on guitar neck and actins might be whatever it is your do to make that happen (I have no clue, I don't play guitar
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I know that my first read through of the book I got all the way through it before going back to start implementation per the sequence that was suggested starting in Chapter 4. Then the subsequent chapters give you the details for each step of the process.
I also find that the GTD Methodology guides are well worth the $. I have them as physical cards and use them each weekly review and whenever I get stuck processing. Now they are only available as a digital download. What I'd do is buy the PDF for $10.00 and consider laminating the pages for reference.
On the time commitment. I know it sounds horribly inefficient to spend 1-2 hours a day just figuring out what to do. But the fact you are here says what you are doing now isn't working so you are looking for some other way. 1-2 hours a day is for processing your incoming stuff so you can relax and give full attention to what you need to do in an appropriate manner. Think of it like meditation or exercise or eating a healthy balanced diet or any other major life changing task. The benefits are many but it takes time to learn, time to implement the habit and once you do you wish you had done it earlier.
Also keep in mind that it doesn't have to be all at once. I personally process inputs in bursts. I process the notes I made at night first thing in the morning when I can still probably read what I wrote in the dark overnight. That might only take 3-4 minutes or it might take half an hour. It all depends on how much I wrote down. I process email at set times usually for me when I am at medium energy level. I process paper mail at low energy level. I process the other various bits and bobs of stuff usually right after lunch and the goal is email inbox to zero 4 times a week or more, paper inbox cleared to zero at least daily. Other inboxes I also try to clear several times a week at a minimum.
I moved to a digital system for my list management, and most reference as well as my calendar. I use Omnifocus for list management, Apple Calendar for my calendar, Apple Mail as my mail client and DEVONThink for digital reference. What will work for you will depend a lot on your computer ecosystem and how you work. You should like your tools. If you stay on paper then investing in a fancy pen and high quality paper is a good investment if you enjoy working with it. GTD should be fun and enjoyable not drudgery.