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I think you'll need one of these to smooth the transition...
https://www.razer.com/gaming-keyboards/razer-huntsman-v2-analog/RZ03-03610200-R3U1
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Don't go for the cheapest mouse you can find. It's useful to have more than the regular number of buttons on it so that you can put the most common/natural actions on the mouse.
Me, I've been using trackballs for work and gaming for years. This kind:
I find trackballs much more accurate than mice. Also, since it doesn't move around the table, for gaming I can keep the trackball close to the keyboard, have my left hand over the left of the keyboard and my right thumb (less often my right forefinger) handy for a quick stab at the keys down the right side of the kb.
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It's very easy to pick up but to get really good with mouse aiming takes practice. All gaming mice these days go up to crazy high dpi but don't think you need to use really high sensitivity. In the mouse software you can set the dpi up then in game set the sensitivity low so it evens out. I really rate Corsair mice, they're relay well priced and work great. I've had 2 Razer mice that cost twice the price of my Corsair and both developed double clicking.
How have people found going from controller to Keyboard and mouse? I mainly play FPS and looking to swap over, got my eye on a cheaper keypad & mouse combo to start with and see how I get on.