Alright well all you have to do is practice really, it may took a little bit of time to finally get the hang of it but yes it does get ezer over time. Im not too sure about the mouse thing because im on a laptop and i use the touchpad and it works veryyy well 4 me. the aiming isnt all too hard. lol mybe just to help you can download a cham and use it to practice. In case you dont know what a cham is its a wall hack to where you can see through the wall. If you want the download to the link here it is and the instructions to install
[Pic-Tut] MPGH Pub Hack (Choob Friendly!!) - MPGH - MultiPlayer Game Hacking (Hacks, Aimbots, Hackers)
If you do decide to download the hack just go to my thread and see how yo get rid of that stupid D/c my link is=
If you have any q's just PM me. If i have helped then plz thank me by clicking the little medal at the bottom of the thread in the lower left hand corner Thank You!