Yeah, the timing should be off by like six frames because of hit stun.
If you do it enough you'll learn the timing for missed and hit fairs without conscious thought. You really don't want to miss with the first fair though. Are you jumping directly into SHDF? Reason I'm asking is cause thats dangerous. Just don't use SHDF as a combo starter is what I'm saying. To answer you question just practice it alot.
Ah-ha! Thank you, eleven arrows. (tee-hee, puns)
I have been practicing. But the annoying part of my practicing is that I have only one controller. (I am semi-like PC Chris, don't own a Gamecube, just periodically borrow my neighbor's Gamecube and she keeps one of her 2 controllers. Although I do own a copy of Smash Melee that is fully mine. hehe, paradox.)
But yes, with that one controller it is SUPER annoying. Training mode doesn't let you use C-stick, which is what I do for aerials, and putting a computer in versus mode is annoying cause they won't leave you alone. I'm trying to find out if the fairs have different timing in the air but they always get in the way so I can't do swishes consistently to compare muscle memory. (swishing air, not hitting anything)
Now for IrArby, well it's one of my main combo starters. I ask if there's a time difference for the reason of my friend who plays Link. I'll use a fair to block a boomerang/arrow then use the 2nd fair to hit Link instead of using a jab/ftlit which leaves Marth partially stunned.
Also in general, like if I miss the 1st fair, I'll pull out the 2nd one to hit the unsuspecting Ganondorf who likes to rush in thinking there's an opening. Then I go and do another SHDF after the Ganon gets hit by the outta-nowhere 2nd fair. That also happens generally when I miss the 1st fair.
Well what combo starters do you suggest? I usually do side-B side-B side B, down B to rack up damage starting from 0 if I can. Also upthrow to uptilits, then full hop Bair to Fair.
Fthrow to Bthrow then fsmash/tech punish with dash attack to set up for all sorts of stuff.
Then from there just keep 'em away with Nairs/dtilts/ftilts till they get sent far enough for me to do Marth's specialty:Edgeguarding. I got edgeguarding down really good.
I use Nair's a lot, full hop, short hop if they miss a tech and I'm dashing towards them.
Critique that strategy too since I just realized I typed it all out. he.
Oh, and I just came up with another question, difference/preferences between Bthrow and Dthrow?