Vionce, i probably know the falcon matchup better than any other matchup, and its definitely doable. There are 2 things you need to know in the matchup: dont get grabbed and dont get comboed.
If its a grab happy falcon, prioritize with tilts and jabs. If you do get grabbed, i find tech rolling away is the best option, using it about 75% of the time because it limits his options - hes fast.
To beat out nair, crouch cancel everything. To beat the knee, time a jab well or you can space a retreating fair if the u-ftilt isnt working (which it typically should).
To avoid getting comboed, di away. Always away, even off stage. Up and away or down and away are my go-tos, depending on percent.
Now, on the offensive: grabs are LETHAL in this matchup. One grab could be the stock with successful tech chasing (READ ACE'S GUIDE ON TECH CHASING FAST FALLERS). I like to do grab to stomp to grab to fair and on small stages (eg yoshis, FoD) that sets up for an edge guard that should mean the stock. Work on influencing which way he tech rolls with mindgames.
Learn to do the rockcrock. Its not super helpful, but its totally bad *** when it happens and you get mad style points haha.
Ooh, one more thing: shielding is bad. Dont shield unless you absolutely have to. You can outprioritize all of falcons moves.
Whew. Hope this helped, man! happy ganoning.