Heater hose

Any know how hard is it to change a heater hose yourself? is it a long and hard job or fairly easy?

Which heater hose? Most of the hoses aren't too difficult to replace. If you are talking about any of the heater hoses on the back of the engine leading to the heater cores, getting access too and the clamps off is usually the hardest part. It's a tight squeeze back there.