GTA: San Andreas for PC; Need help

[Daliman]

#1 Is it just me, or is shooting at people in this WAY harder than any FPS game?
#2 How the F do you get the timing down in the lowrider challaenge. When I wait until the arrow is directly inside the box, or even JUST entering the box, I always get a "too late", if i do it a bit before, it almost seems to randomly tell me bad or good, but either way, I can't beat this. In a VERY similar minigame in the Leisure Suit Larry game, I do great, and that one is MUCH faster. ANy ideas?