1. Most cars with synco-mesh don't like changing into 1st from a higher gear unless fully stopped, or close to it.

2. Common problem with the K-seires gearboxs is the knotchy gearbox (1st-2nd for Pre-facelift, 2nd-3rd for facelift). Only option you have is to either live with it, or get a new gearbox that dosn't have this problem.