When it starts to warm and I notice the first hair coming off, I start dedicating extra time to working on getting the winter coat off.
This took more time when I was leasing Jack, my old pony. He had the typical pony coat - massive fur ball.
Now that I have purchased Amber, I doubt I will spend as much time. She has a relatively thin winter coat. During the period of shedding, I have a personal method I like to follow to remove the dead hair. I start with a jelly curry using the fine side. I go over the horse once, and then I use the shedding blade all over in the "main" spots that seem to be releasing hair, until I am getting minimal hair coming off in each spot. When I finish that, I go over the horse again with the jelly curry and then go about my regular brushing.
The first day it is warm enough to bathe, I do so using my jelly curry after a ride. When the horse's body is warm from exercise, the hair will release better. Getting the dirt and dust off releases even more hair, and the jelly curry of course does wonders to help pull it off.
That usually takes care of the winter coat pretty fast. Also on that first bath of the year, I thoroughly wash the mane and tail and condition it.
Around the time of the first bath, I also do some general trimming. Bridle path, whiskers, ears, feathers (no matter how minimal - pet peeve of mine except on breeds that are supposed to have them). Ect. Although I do this year round, I also clean the eyes and nostrils. Nostrils get done much more in the spring because pollen is terrible for collecting in there and causing allergies! Jack coughed and sneezed quite a bit last year, despite regular cleaning and effort made to keep his nose pollen-free.