if you want to learn something then the fundamental principle is do that as much as you can, let suppose you do that work very few times, maybe once a month or 5 times in a year then chances would be it will take you too much time to hone the craft, on the other hand if you do that work very frequently like everyday or evey week or twice a week then chances are you will get result very soon. that's my point. nothing more than that. i hope you will understand. Thanks nathalie.