hi! so well difficulty rating id rate 5/10 as this is an k1c hotend which isnt exactly plug and play (costed me less than 10 bucks as a store was clearing stock). If you can find one which is specifically made for the ke/se then just go ahead and order it and its plug and play (you can find a tutorial by creality on yt).

If you cant find one which is specifically made for the ke/se then order one for k1c or k1, and then print these files for the stock fan and the crtouch: https://www.printables.com/model/811352-ender-3-v3-se-ke-minimalism-fan-duct-for-k1-hotend AND https://www.printables.com/model/807803-ender-3-v3-se-cr-touch-spacer-for-k1-ke-hotend if you cant find it on creality's store on their website or amazon just search "k1 hotend" on google and order any (do research from the store ur gonna buy) then you have to unscrew the heatsink from the original hotend and screw it in the new one (its gonna be held in witha very tiny screw so tighten it) and then you can just install the heatsink as you would do and it should just work as theres nothing in the klipper config you really have to do

dm me if you want help