Not as hard as you'd think if you have basic plumbing skills.
Dpsc;ao,er beomg tjat upi are sp,ewjat ;o,oted bu
Ooops... Right hand was off by one letter on the keyboard.
Disclaimer being that you are somewhat limited by what you have to work with in the way of existing plumbing. If you have a shot shut-off valve is about the biggest speed bump.