Aiming was super intuitive and I got that down pretty quickly. The thing I had more trouble with is movement. I think controllers have that down way better. I also had a little bit of trouble using all the other keys that stuff were bound to and then returning my fingers to WASD. I'd always have to look down and that in turn would get me killed. It's gone away with practice but I still prefer movement with an analog stick.
Interesting. I'm the total opposite. I've grown accustomed to the key bindings (part of it is I'm very familiar with a keyboard and can type at 120 WPM consistantly, I've taken many tests). It's the mouse sensitivity that makes it difficult. I play with a very high sensitivity because I'd rather get used to that now then try and get used to it later.
Oh, don't think that higher sensitivity means better. You should play with whatever you feel okay with, even if it's super slow. Actually, I watch this youtuber who played Counter Strike "professionally" and he says most of those guys play with super low sensitivity and large mouse pads. I'd actually agree with that setup.
My sensitivity isn't really high and I also have a rather large mouse pad. Sniping and recoil management is tremendously easier with lower sensitivity because you can make those very small corrections with more generous amounts of hand movement. The higher you set your dpi that harder it's going to be to make those subtle corrections because your pointer will go haywire with every small hand movement.
Also, I can't remember what you posted in the other thread but you should make sure you have absolutely no mouse acceleration. Otherwise you'll be overcompensating and overcorrecting on top of the high sensitivity setting.