It seems like the longer you use a tool the harder and more uncomfortable the handle seems to become. Even if you wear gloves, your hands can become sore and cramped if you are using a tool for long periods of time.
So what do you do? Get some pipe insulation! This trick is great because it can work for any kind of tool: trowel, tiller, shovel or a rake.
Using pipe insulation can make handles on tools softer and easier to hold on to. The foam cushion can also help avoid blisters.
Just get yourself some plastic-foam pipe insulation that is sold at any hardware store. It already has a slit along one side that will slip over the handle really easy, you just need to cut the insulation to the proper length.
Then slip the insulation over the handle, and secure it with duct or electrical tape at each end to hold it in place. I think your hands are going to be much happier with you!