Even if you use direct electrical heating you will in practice use less electricity for heating and lighting combined with CFL's. The waste heat from incandescent bulbs emitted near the ceiling and largely staying there is much less efficient at heating the inhabitants, the only thing that really matters, than heat from electrical heaters lower down.

Even in theory, you could only finish up using the same amount of electricity at times when you need both heating and lighting and there can be very few places that do not need lighting without heating at some time. If you are heating your house with a source that is more expensive or polluting that direct electricity, allowing for for all the losses in generation and transmission of electricity, then you should change to electrical heating.

If you require cooling and lighting at the same time then the advantages are multiplied as with incandescents you are using electricity to produce waste heat end then more electricity to get rid of it.

The longer life of CFL's means the overall cost will always be cheaper unless you are foolish enough to heat your house with some means more expensive than electricity when you have this available to use.

As for 'simplest by far' what is complex about changing a light bulb?