Grinding tree stumps is not something we recommend taking on as a DIY home project. The stump grinder we use is a commercial stump grinder and is top of the line, state of the art equipment and does the job very quickly and efficiently.
Some people try to dig the tree stumps out or use a stump dissolver or stump removal chemical, this can take years to work and leave an unseen void in your yard that can be dangerous if you happen to step on the area where the tree stump used to be.