If you play an instrument VinuJ comparing it to Smash is actually a great way of putting technique practice in perspective. Nobody likes sitting on a piano and practicing scales over and over, or the painfully slow process of learning a piece. Likewise, sitting in the lab doing repetitive tech practice ain't any fun. But after hours of practice and dull monotony, hitting those keys on time and letting your fingers play on their own is nearly unrivaled in satisfaction. Something that comes close though is Smash, and putting all those techs, nuances and knowledge to work creates an on-screen interaction that is close to a symphony, and the euphoria that comes from an earned victory is extraordinary.
Playing piano for a few years has taught me that, and new players should do well to remember that while the practice can often seem insurmountable, the payoff is more than worth the lab time.
While I do agree with the instrument playing stuff, I have to say that is not true for everyone, or let's say, there are better learning methods for some... Well, here's how I learned the basics and quite a few of the techs. Styling.
When I started competetive Smash (I started with brawl competitivly...) I coudn't do a single tech. However, my training partner was as bad as me, so it didn't really concern me. Then, whenever I got a kill (or a break from battle) I would try to do all that fancy stuff people in YT vids do (Shff ing was the first). I would just sh nair ff all over the place whenever I could (was playing marth, back then with no lag, so it was pretty stylisch). Over time, it kinda worked itself into my playstyle and became natural movement. I was able to do it this way since I had alot of fun playing, and I enjoy showing off a bit. Same with Dashdancing (yes, DD is useful in both brawl and Sm4sh) and over time, it almost became my signature move (or well, my DD-foxtrott-RAR mixups, and of course, local community...). I did the same with Wavedashing in P:M, worked out perfectly fine.
TLDR What I want to say with this, to me it mattered alot being able to play and figuring stuff out while doing so, since that was optimal time using, I got to play, I got to practice and it was alot of fun so I was able to stick to it. I can't say this'll work for anyone, but I believe it's something worth trying out.
On a sidenote, as for playing instruments, I played guitar for like 7 years, went to courses and stuff, did all the basics etc, but it just didn't work out. However, I bought an E-Bass a year ago and leaned it on my on, watching YT videos and trying the most fancy stuff. Funny thing, I can pull of that stuff now, I can play pretty properly. Then and again, I often notice how much of the basics I lack (I can't string-mute at all).
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VinuJ
As for the recovering issues, there one thing that relly helps. Calm down, focus. Vanish Takes forever to activate. In addition to that, no matter where you're stick is, the initional of vanish will always go straight up (except glides or you got hit before but thats already pretty advanced). So when inputting vanish, make sure your stick points straight up. AFTER you see it activated, angle the stick to the necessary direction. Practise that, whenever using Vanish remind yourself "Stick first up, then angle". You should get used to it pretty quickly. Same goes for Boucing fish, where you don't gain much from pre angling your stick (of course, you can enlengthen and shorten, or even reverse it but again ,thats pretty advanced.) Also, for Bouncing fish, make sure to use the Attack / A key if you want to kick early, or use the second kick. With this, you make sure to not Side-B after BF (if anything, you'll just fair...).
Last note, baiting and reads are super hard and often require you to understand your character pretty good already (as in, what does it matter if you read the roll, if you have no clue how to punish). Ok, that goes hand in hand, but still. This is something lvl 9 CPUs are actually pretty useful. Techskill practice. Since you can't read a CPU, you have to rely on you techskill in order to beat them (ok, even the CPU have silly patterns that you can figure out but thats usually not worth long-term wise).