What tutorial to follow?

How good must I get on BLD 2x2x2 to try BLD 3x3x3?

Don't worry about the time it takes you to solve it. If you know how to solve the 2x2 BLD (without messing up any algorithms or setup moves) you're good to go. 2x2 is the same as solving 3x3 corners anyway and that way you'll get used to parity also.
 
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