If you are using KISSlicer, you might find that support material is somewhat hard to remove, as it is more dense in the areas just under your desired print. There are a few settings that you can play with to change to degree to which the support material sticks to your print.
The main setting is Gap. Gap determines the programmed distance between the support material and your actual print. A good gap to start with is 0.5 (millimeters). Too large a gap and the support material won't be able to do its job of holding your model in place as it prints. Too close a gap and your support material won't be easy to remove. Some users have had good prints with gaps as large as 1.0.
You can also adjust the support angle. This determines the level of overhang that will trigger the use of support material. A good rule of thumb is that you set it to 45 degrees. Some users have set this number lower, but the quality at which an overhang comes out at will depend on the geometry of your model.
You can also consider whether or not to sheath your support material. Sheathing adds a perimeter around the support structure, which might make the support material stronger but more difficult to remove.
In addition, you can limit the height of the support material by setting the Support Z-roof. This setting may be useful if, for instance, only the lower part of your print requires support material.
If you've already printed your item and need to remove support material that is difficult to get off, you can use a small pliers to grab and pull off the unwanted material.