A beginner probably doesn't know what 'double sledge' or 'inverted sexy' means, and you're moving ultrasonically fast for a beginner. You said "do a sledge, or whatever you're used to..." -- beginners aren't used to anything!
That's a cool technique and probably faster than beginners method but I don't think it's a very good introduction to advanced F2L. But, if this isn't the goal then that's a decent method
A beginner probably doesn't know what 'double sledge' or 'inverted sexy' means, and you're moving ultrasonically fast for a beginner. You said "do a sledge, or whatever you're used to..." -- beginners aren't used to anything!