so i finished my ss conversion this weekend and went for a couple rides. i've mentioned here before on another post that there are a couple (what i now consider) major hills i have to negotiate before i get into any flat riding terrain. i tried my best but could not get up either hill and had to walk. so i'm considering changing from my current 46/17 (73.1 gear inches) gearing to 44/18 (66 gear inches). i'm not experienced enough to know how the difference in gear inches will feel so i'm hoping someone here will be able to give me some insight. as always, thanks in advance for any replies.
p.s. (warning, noob question) is it possible to change the chainring without having to remove the crank arm? i currently have a set of sugino rd's.