hi. i am interested in getting mechanical disk brakes and need some help. my bike has the mounts on the fork and frame but not on the hubs. when i buy them i will need to get new hubs too? do i have to get whole new wheeles or can i just get the hubs? is it hard to put the hubs in the wheel and connect the spokes? i can do minor bike repain but dont have a truing stand.also it isnt that hard to put on the disks ,,, is it?

thanks alot ,,

karl