Removing a bolt from a lawn mower is a common task that can be completed with a few simple tools. The most important tool is a properly fitting wrench or socket. If the wrench or socket is too small, it will slip and could damage the bolt or the wrench. If it is too large, it will not fit properly and could also damage the bolt or the wrench.
Once you have the correct wrench or socket, you need to find a way to hold the bolt in place. This can be done with a pair of pliers or a vise. If you are using pliers, be careful not to damage the bolt or the pliers.