The main thing you need is discipline.

Since I have little of that all the various note taking approaches I have tried have failed. I have tried mini-recorder, plain notebooks, zeroxed Ansel and other forms and even tried to put them into computer form. None lasted long as there is always something to interfere such as changing light, weather, my dog and of course the all purpose "I forgot".

I still try and am lucky to get maybe 50% success but until I can buy some discipline the forms aren't going to do me much good. Good luck, you may already have the discipline and if so a piece of paper and a pencil will do.