Transitioning from Controller aim to MK

While I can't personally relate, having grown up as a PC gamer, I can safely say that it will take plenty of time and dedication to make the switch.  It's a change that you'd need to commit to - you have to stick with the kb/m controls even if you're feeling frustrated because you're just going to set back your progress going back and forth.  You will get used to it eventually, and it should improve your reaction time and accuracy in the end, it's just a matter of how much effort you're willing to put into the transition and whether you think the end rewards are worth that effort.

Some tips to make it easier though: Make sure your mouse is set up properly (make sure the sensitivity in Windows is at the halfway mark and acceleration is disabled, then tune the DPI so the mouse cursor feels the right speed on the desktop, and try to stick with a native DPI for your mouse.)  If your mouse has adjustable weights, figure out if you're more accurate with the mouse lighter or heavier.  Figure out your ideal FOV in games (also be aware of horizontal vs vertical FOV, and what each game you play uses) and stick with it, because this drastically affects how mouse aiming feels.  You can also use an aim trainer (Aim Lab on Steam is free) to fine-tune your sensitivity and there's a very handy website https://www.mouse-sensitivity.com/ that will convert between games so you can perfectly match the sensitivity no matter what you play.

After typing all that out it sounds far more complicated than I thought it would but it really isn't that bad.  Once you get your mouse, FOV, and sensitivity set up you basically never need to worry about those things again other than making sure that you match settings in new games.

While I can't personally relate, having grown up as a PC gamer, I can safely say that it will take plenty of time and dedication to make the switch.  It's a change that you'd need to commit to - you have to stick with the kb/m controls even if you're feeling frustrated because you're just going to set back your progress going back and forth.  You will get used to it eventually, and it should improve your reaction time and accuracy in the end, it's just a matter of how much effort you're willing to put into the transition and whether you think the end rewards are worth that effort.

Some tips to make it easier though: Make sure your mouse is set up properly (make sure the sensitivity in Windows is at the halfway mark and acceleration is disabled, then tune the DPI so the mouse cursor feels the right speed on the desktop, and try to stick with a native DPI for your mouse.)  If your mouse has adjustable weights, figure out if you're more accurate with the mouse lighter or heavier.  Figure out your ideal FOV in games (also be aware of horizontal vs vertical FOV, and what each game you play uses) and stick with it, because this drastically affects how mouse aiming feels.  You can also use an aim trainer (Aim Lab on Steam is free) to fine-tune your sensitivity and there's a very handy website https://www.mouse-sensitivity.com/ that will convert between games so you can perfectly match the sensitivity no matter what you play.

After typing all that out it sounds far more complicated than I thought it would but it really isn't that bad.  Once you get your mouse, FOV, and sensitivity set up you basically never need to worry about those things again other than making sure that you match settings in new games.