Sometimes clicking by voice command can become tiresome. If you are unable to use a regular mouse to click (taking some of the burden away from your voice), another good solution is to get a foot pedal.
A great option is the Kinesis Savant Elite Programmable Foot Switch
make sure you get the "Savant" not the "Advantage" as the Savant has USB, and the Advantage has a different connector.
It is very sturdy and allows you to rest the weight of your foot on the pedals without accidentally triggering clicks.