Learning it as you see it would be horribly confusing and difficult. If you just spend a short amount of time each day practising, you should have it down within a couple of weeks. Another reason the lesson notes will be no good is because you won't be able to learn the proper stroke order, which can make your handwriting illegible.
Some people try a similar "learn as you go" approach with kanji, but that can practically be asking for trouble. Although it might seem difficult learning 2000 characters, there are a lot of repeated parts, known as radicals, that can really help speed up the process. For example, instead of learning 質, first learn 斤 and 貝 and simply put them together. I believe there are a few books that take this approach nowadays, so be sure to check them out starting with RTK