Cost for putting switching auto Transmission to manual

[flatbed94kid]

I may be wrong but i think eaton says it is best to double clutch. Me, I would do a little of both, but mostly float, idk, all that clutch pedal etc kinda tiring. And if you do a wrong double clutch it will jerk the truck a little bit so I would say for me to float it and feel the gear go in and don't force it in even if you are frustrated, just like dancing with a lady, nice n easy. But yea, is it convertable to a manual? the 10 speed smart shift?