So long as it is not to wet March is the best time to lift and divide herbaceous plants. When the soil is warming up they should settle well.
You will be able to plant earlier if you put compost on the garden (the darker the better) as in this way the beds will absorb most sunlight and nutrients.
Mulch applied to flowerbeds at this time of the year will help to conserve moisture during any drought. It will also keep down annual weeds and feed the plants. A selection of wood chippings, horse manure and grass cuttings should do the trick.
Finally remember where the daffodils are. They only flower for a short period and if you do need to move them you need to mark out where they are.