^ that's the best way to get a Nair in the face
wavedashing back is good if you predict the first aerial after the lazor's spamming, while you're pressured the best way is Fairing out of shield, or Dairing, it depends on the position of Falco on your shield. Watch out for shield stun and get the right moment to come out with the Fair. Falco is not as fast as Fox, so his pressure is not so difficult to punish, Fox can be a pain in the *** if he's good.
I suggest moving your shield Up-Towards Falco, cause it slows his pressure, and let you a frame window to punish him. Good Falcos are not going to pressure your shield blinded, cause it will get 'em punished, probably they're going to space their aerials to avoid and bait shield-grabs (Mango anyone?). So don't rely on shieldgrabs all the time, it works just when you see the Falco screwed up his pressure.
Light shielding can be good in some occasion. It sends you far and can get you a well spaced Up-B OoS.
anyway Brookman is not wrong, wavedashing back works if the Falco is screwing his spacing. So watch carefully his movements.