Early fall is a great time for planting hydrangeas as long as cooler temperatures have arrived. Limelight and Little Lime perform best in more sun so choose a location where they get more than six hours of sunlight. I would skip fertilizing until spring though. Maintain 2-4" of organic mulch at all times of the year and water the soil if it is warm and the soil feels dry to a depth of 4". Once the plant goes dormant, reduce waterings to about once a week or every two weeks, depending on local rains.