Changing the mode if you already fly "1" is the worst thing to even think about!!! Just about as bad idea as trying to change the golf swing you are used to off! Just think of "Ian Baker Finch" LOL.
To master 3/D takes years and years of hard work, and some guts,

Starting with something like this, light&slow and plenty of power helps.
but then again, there are a 3/D and 3/D standards. The best way to start is with the lightest model and 2 to 1power ratio, so even if you prang it there is a minimal damage. (hope not crashing it at full bore into the gate!, LOL)
Forget about books and video theory, that won't help you, get a plane out to the field, practice and more practice, it's all about co-ordination and muscle memory.
Naturally, the talent plays a part, some people just can't do it, same as some pilots I know off flying basic trainers for 50 years and still can't land it with out nosing over or sommersaults, LOL.
If you are young you will master it lot quicker than an old man.