I think which system you use must depend on two things:
what kind of person you are and what your health issues are.
If you have been told to take it easy for a certain length of time after an operation or an illness, I think you just have to ignore the mess around you, unless you either can afford to pay a cleaner, or have a spouse who can and will take over your work for the duration.
If we are talking about a permanent condition, or just the lessening of energy and strength natural at our time of life, obviously we have to find some way of dealing with the fact that we can no longer work eight hours at a stretch or whatever we did when we were younger.
For me it is trial and error - I try to find the amount of work I can do without tiring myself out completely.
I no longer whiz round hoovering all the floors and dusting all the rooms in the course of a morning, but spread it out over a couple of mornings.
I have more or less given up gardening, which I hate, and hope next year when DH at long last qualifies for his pension (long story - the short version is they keep moving the goalposts) that we can afford someone to mow the back lawns and cut the hedges and that we can find the money to turn the front lawn into a paved garden with a couple of tubs of plants.
But I am in the fortunate position of not having anything wrong with me, only the diminishing of vigour that accompanies getting older.
If you do have a serious health issue, try and get your consultant, your G.P. or a nurse to tell you exactly what they mean when they say "take one day at a time" or "pace yourself" two meaningless phrases that everyone understands differently, which is of no use to us who are given the advice.