@wis
i am working on it

. it could take some time though ^^.
+ i think you are wrong: 4 are very hard for me, i don't believe that you will have it easy learning 4d when you are really good with 3d, because it is a completely different motion. (same counts for learning 3d when you are very good with 2d.)
but i guess time will tell what it is gonna be for me.