I personally learned wavedashing first, before any other technique, followed by shffling (I never messed with each individual part, I just learned shffling all at once). I mained Samus at first though, so wavedashing was really important (I switched to Fox when learning shffling, because it's almost useless for Samus).
There's no reason to learn with someone slower, really. If you look closely, you can see the difference between an l-cancel and a missed l-cancel on normal speed, even with almost-lagless aerials (Marth's/Shiek's fair).
Also, using this stuff in combat is very intimidating to think about at first, because of how absurdly complex it seems. I have some questions for you though: Do you play any musical instruments? How fast can you type on a computer? Do you play DDR?
If you play a musical instrument, you know that it's all muscle memory. Playing quickly isn't hard, because you're body does it reflexively, without you really having to think about it. Same with DDR. Seeing tons of arrows falling looks harder then it is, since you're doing everything on instinct anyway. Typing is also identical in idea. Of the 50-odd keys you need to use on a keyboard, you just know where they all are reflexively. You don't think "aww, ****, where'd that P key go again?"
Same with smash. Eventually (by this, I mean maybe 2 months. Yes, it dosn't take that long for most people. It takes even less time for some), you won't have to think "omg that guy's gonna dash attack, quick, jump and airdodge diagonally!". You'll instead not think at all: You'll see the guy about to dash attack, and you'll just wavedash back and kick him in the nuts with an fsmash (substitute "nuts" for "face" if not a human male character. Substitute "face" for "body" if Jiggs or Kirby). It'll be as instinctive as breathing.
EDIT: Upon re-reading this, I realised it's all over the place and completely fails at coherence. I apologize for any unnessisary thinking you may have to do to understand wtf I'm talking about.