What's your full team again? If you're still doing the ultimate BnB from the srk forum, you might want to put that combo on the backburner and learn the more basic one above it first. Some people might disagree, but when I start out with a new character, I try to find a simple damn-near-undroppable BnB before I move on to learning more difficult optimized stuff. Even after you move on to better, more damaging combos, there are always times in matches where you're about to land the killing blow regardless, so why not fall back on something basic and eliminate the chance for error?
In this case, it makes even more sense to learn that more basic Dante combo first, since against smaller characters, it is difficult/impossible to connect the j.H, air play, j.H sequence after the jump cancelled volcano and you'll have to use the simpler combo anyway, even after you master the better one.
It took me a long time to get comfortable with doing magic series into stinger and properly transitioning into a combo on hit or bold canceling into reverb shock xx fireworks on block. I still fuck it up sometimes. Just keep at it man!
